Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf0672cc9c34f37…

MALICIOUS

PDF

67.2 KB Created: 2021-04-04 08:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ff71b1f6f977d39326712f941099aef SHA-1: c4107cf9bef3c5b196ec579cb29f0d60d40d9a55 SHA-256: bdf0672cc9c34f37557e4c3ac1a26a661e9ef48c54e35af0128b550a15df9431
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide a clickable link. The document contains numerous external links, including one pointing to 'https://jacksth.ru/strik?utm_term=shakespeare+sonnet+18+bangla+translation', which is highly suspicious. ClamAV detection and ML classification further support its malicious nature, indicating it likely serves as a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8932

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://jacksth.ru/strik?utm_term=shakespeare+sonnet+18+bangla+translation
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