Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ba20cd3f01b088…

MALICIOUS

PDF

35.9 KB Created: 2021-09-10 12:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 838d8f549ed6845c7eb320128251e826 SHA-1: b4a4f8a72679727e3c5bf5547d9c3bb8a4d39772 SHA-256: b1ba20cd3f01b088b69c614e1dd77a409f5f78890e6399d47df6c0125d44776b
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing attacks, designed to trick users into clicking embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's part of a chain to deliver a secondary payload or redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7249

Heuristics 4

  • 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 35 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 http://ncfc.com.tr/ckfinder/userfiles/files/wijiv.pdf In PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/54864118355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=amateur+surgeon+3+apkPDF link annotation

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