Malicious PDF — malware analysis report

Static analysis result for SHA-256 e788c1f6573a0506…

MALICIOUS

PDF

35.8 KB Created: 2021-05-27 10:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d23a68f45944016cdaf35ca93787cb08 SHA-1: 649cb929ffc3533597d2c0c103f1ce42387d7985 SHA-256: e788c1f6573a050623c65def868458d87fa60d4b638065097015d5da79bd1539
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by multiple heuristics, including a critical finding for a malicious redirector link. The document's structure suggests it's an image-only lure designed to trick users into clicking the embedded link, which leads to the known malicious infrastructure at 'https://yafferge.ru/strik'. This pattern is commonly used for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7036

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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 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.
  • 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://yafferge.ru/strik?utm_term=pearson+learning+solutions+book
    • https://vinedenakebuz.weebly.com/uploads/1/3/6/0/136020142/2724177.pdf
    • https://static.s123-cdn-static.com/uploads

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