Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45a6f182c8ede66…

MALICIOUS

PDF

36.6 KB Created: 2021-06-08 03:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a37b1379f13597e10cc50461d973a920 SHA-1: 96da70fdcd8f14ac317d4ee8f388799b00ac5a34 SHA-256: b45a6f182c8ede66277cdaccd1098bfb2fe8ca6cadbfdd115d64547c26015e9f
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide clickable links. The heuristic 'PDF_IMAGE_LURE' confirms this, indicating the document's purpose is to trick users into interacting with an embedded URL. The embedded URL 'https://cructi.ru/uplcv?utm_term=morfemas+flexivos+y+derivativos+ejercicios+pdf' is the primary IOC, likely leading to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6071

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-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 36 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://cructi.ru/uplcv?utm_term=morfemas+flexivos+y+derivativos+ejercicios+pdf PDF link annotation
    • https://avgdesign.com/userfiles/file/30455365897.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210605_184215.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8922364f6c---zibaraw.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/5ab2821f23735dc0bbf2a0b62198adc0/genurepilifaxonu.pdfIn PDF document text

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