Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8da80d211aef9e…

MALICIOUS

PDF

81.0 KB Created: 2021-01-01 12:30:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 233e9c0fa56f419b5fb32ed2537f7c9f SHA-1: 79bfca55fb62d7d32fe3550784ede20377fcf3cb SHA-256: bf8da80d211aef9e698d90f5a9c307d3d527ba5a82a3a2138402687d3a7c171e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic indicating it's a malicious redirector link, specifically pointing to 'traffmen.ru'. The document body, though truncated and obfuscated, contains text related to 'wkhtmltopdf' and a date, suggesting it might be a generated document. The presence of a malicious URL and the 'SE_INVOICE_LURE' heuristic strongly suggest a phishing attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://traffmen.ru/123?utm_term=can+taking+lamictal+cause+weight+gain In PDF document text
    • https://cdn.sqhk.co/xurazegoba/BhfvsGq/razisorogitozozep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449984/normal_5fecc6b43ac44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_5fa4aade75eb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f875b72673cd.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/dfabdbdea7bc7.pdfIn PDF document text
    • https://rasiporimi.weebly.com/uploads/1/3/4/6/134614798/9032528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409093/normal_5fe52dccb7978.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e63a791-ff9b-488f-831f-125229397c70/albert_fish_autopsy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36744c8d-29ae-4d69-a7ee-7a040c5cd027/vofiluxopikujuxexe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 5180 bytes
SHA-256: 165828e4c6493eaf3da26972238906e6ae7fa6ec70212633c91587ea0ac37735
font_01_sfnt_off00011290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11290 11048 bytes
SHA-256: a4f1fb130a860018c2b33d391cbc9086e31e33132a2a300e95b406c3ff943732

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