Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f426468d8ba5137…

MALICIOUS

PDF

69.7 KB Created: 2020-12-09 04:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 298637ddb338d8690f0672f23469fd2f SHA-1: d420e6a66b11a5931eb1e53f2a253a35533d8646 SHA-256: 0f426468d8ba5137471b8e47d1ecea0bbb2f119fb1c0658462a0340e878496b8
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URLs, 'https://trafffi.ru/strik?utm_term=my+hat+it+has+three+corners+meaning', is directly associated with the malicious verdict. The presence of numerous links suggests an attempt to direct users to potentially harmful content or to manipulate search engine rankings. Although no scripts were explicitly extracted, the nature of the link farm and the ML classification indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/strik?utm_term=my+hat+it+has+three+corners+meaning
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/botisulori_xilelijubi_fivekedofisu.pdf
    • https://cdn-cms.f-static.net/uploads/4500692/normal_5fb5876d4b194.pdf
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/25e035.pdf
    • https://cdn-cms.f-static.net/uploads/4482190/normal_5fbf585f1770f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/09d52d6b-199b-4e55-a897-d33c681b1487/81946900213.pdf
    • https://static1.squarespace.com/static/5fc5a8f52bbd74065826fdfd/t/5fc70ac17995075abdda78b1/1606879937338/daily_routine_checklist_template_excel.pdf
    • https://static1.squarespace.com/static/5fc13070e2fce462bc8dc846/t/5fccd62dd235d37878c4b3f6/1607259695942/world_edit_minecraft_pe_apk.pdf
    • https://static1.squarespace.com/static/5fc0e110403f5353fd95a22f/t/5fc23245e18c5c478e44ee6b/1606562374053/vijunokamumiwizinidaruguw.pdf
    • https://static1.squarespace.com/static/5fc58fccbf71053ccb2f4d5f/t/5fc68ce9a97599144edd5916/1606847721561/football_strike_world_free_flick_league_games_today.pdf
    • https://static1.squarespace.com/static/5fc7957f5f0d731e16ad07f2/t/5fcf8fd8509e863c68358001/1607438305289/scanner_app_document_scan_apple.pdf
    • https://static1.squarespace.com/static/5fc0e0f3f7cf8c75402ad020/t/5fc1dadf3c02f22b9d512049/1606540000086/nationalism_in_india_worksheet.pdf
    • https://static1.squarespace.com/static/5fc66689bdb33045eee7baeb/t/5fcdc069eb18547f4ba3c6f3/1607319661209/17605416571.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe26173570fb44d1cc7600/1606297112333/37834067940.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d190.bin
e3ab2989543fb6f65558f19a7e45606cb63e97e24b65103b2952eaa4db2299c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD190 5288 bytes
font_01_sfnt_off0000e378.bin
36a038764c9724c131c15c77e66e9c6ce53951a2595867324cc3f0b724db7813		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 11856 bytes

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