Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a81552cf9bf6756…

MALICIOUS

PDF

37.3 KB Created: 2021-10-09 16:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 51d4bed2bd4ea378a66dbd5e55c66594 SHA-1: c81e7a5104621caf1c7603ccf0f203daa6c428f5 SHA-256: 1a81552cf9bf67568b3fb284948e62bfa4eef9c98f800efe062e613cd32e15f3
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure due to its small size and image-heavy content. It contains multiple embedded URLs, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit user interaction, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

Heuristics 5

  • 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 37 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://cructi.ru/uplcv?utm_term=printable+grammar+test+with+answers PDF link annotation
    • https://dalton-english.com/userfiles/file/pimilesowejewenokanexazub.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/63705653607.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/948359168.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/bepopomeniguvoruxotodot.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/jejefawozer.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/74474836835.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/ramusaje.pdfIn PDF document text
    • http://dalaichau.com/files/gikovumazowemid.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/noburoladulazakazoz.pdfIn PDF document text

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