Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfe486787a851fc…

MALICIOUS

PDF

52.6 KB Created: 2021-02-07 21:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 9e1f72445ce02f055371755ffe543d75 SHA-1: 14fb4c102e2bf5a3b96a7175fd491247fbfa4231 SHA-256: ecfe486787a851fc1d5fcf8ab38fc1039d804bbc7c1bd3771f97604a50122ded
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users. The primary lure suggests a free antivirus offer, which is a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7181

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/aws?utm_term=best+antivirus+for+android+phone+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390680/normal_60043dea32ec4.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/fipinonizuxuguf-fifisep-dejudarevada.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/bXJjgbr/70668100435.pdfIn PDF document text
    • https://jakazopafekitab.weebly.com/uploads/1/3/4/6/134632018/d92ccd.pdfIn PDF document text
    • https://cdn.sqhk.co/xifusajexom/jgdahFf/civil_wars_sounds_like.pdfIn PDF document text
    • https://luzozesojuximu.weebly.com/uploads/1/3/5/3/135321468/dokedizav_kizozijavufivox_darufugib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_6019947da3bc3.pdfIn PDF document text
    • http://lewuvajenajen.iblogger.org/xevefizawase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_601daf6984a1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393625/normal_5fee84d2a589f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365657/normal_5ffc3809cf0ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453342/normal_5fef8216cb14c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417205/normal_5fdcb49e7d28d.pdfIn PDF document text

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