Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0438a4dd5052a6…

MALICIOUS

PDF

49.6 KB Created: 2021-04-29 06:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e31e634869f45d2f8182ea73e638257 SHA-1: d986a4378eb98f2082299daa2b8e5e5b95e2d173 SHA-256: de0438a4dd5052a6f2abf38b8ff4d012baa13e3c6f83f5f8eb1cc90e4cbe4d4a
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as a phishing lure due to its image-heavy nature and embedded clickable link. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary IOC is the external URL which likely leads to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9369

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 49 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/strik?utm_term=saa+green+book+pdf+free+download
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    • https://s3.amazonaws.com/ditiruz/jogixizexapara.pdf
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    • http://sorisavitekinuj.onlinewebshop.net/viladawulumegisij.pdf
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