coinbsae-extansion-start[.]pages[.]dev

Analysis of coinbsae-extansion-start.pages.dev indicates a high‑risk phishing infrastructure that is currently offline. The domain was registered on February 21, 2026 through Cloudflare, Inc. and resolves to the IP address 188.114.97.3, which is owned by AS13335 Cloudflare, Inc. and geolocated to the United States. DNS resolution uses the Cloudflare authoritative name servers west.ns.cloudflare.com and liz.ns.cloudflare.com, confirming that the hosting provider is Cloudflare. The site presents the page title "Suspected phishing site | Cloudflare" and returns an HTTP 403 status code, while enforcing HSTS.

The TLS certificate is issued by Google Trust Services under the WE1 identifier, demonstrating a legitimate certificate chain but not mitigating the malicious intent. Google Safe Browsing classifies the domain as a social engineering threat, and Gridinsoft assigns a trust score of 0 out of 100, reflecting extreme distrust. VirusTotal reports that 12 of 95 scanned security vendors flag the domain, and it appears on at least one public blocklist. PhishDestroy has also listed the domain as blocked.

The combination of a low trust score, multiple vendor detections, and explicit safe‑browsing labeling provides concrete evidence of phishing activity. Defenders should immediately denylist coinbsae‑extension‑start.pages.dev at network and endpoint layers, monitor for any re‑hosting attempts using the same IP or Cloudflare name servers, and correlate logs for outbound connections to 188.114.97.3. Since the site is currently offline, continuous observation is advisable to detect potential re‑activation or related domains that share registration patterns, certificate issuers, or hosting configurations.