Malicious PDF — malware analysis report

Static analysis result for SHA-256 90998bd74979b888…

MALICIOUS

PDF

50.6 KB Created: 2021-02-05 05:04:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 3ee073cd2572e5fcfc81f9137e80f36e SHA-1: 20d90b92779e48f10872fbcf967335c91fa761e5 SHA-256: 90998bd74979b888069435452b3bb01b03a91b21d823e5219a421d6106217e5e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure related to educational materials, specifically 'balancing chemical reactions practice answer key', which is a common tactic for phishing or malware distribution. It embeds an external URL that redirects to a suspicious domain, likely serving as a download or redirection point for a malicious payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6121

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/aws?utm_term=balancing+chemical+reactions+practice+answer+key PDF link annotation

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