Malicious PDF — malware analysis report

Static analysis result for SHA-256 e709ff1b772efed8…

MALICIOUS

PDF

80.8 KB Created: 2021-03-12 16:26:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43884eac1d26c0d081fc42cb5dac6e27 SHA-1: 9fc0bfcda772fbe9a1852daaacdeb9437daa7146 SHA-256: e709ff1b772efed89a18e84e4fc5b003bd526869def9cdd98a397fd8eb13f82d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous external links, including one to 'dafemum.ru', suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to 'Beatles complete lyrics pdf'. No scripts were extracted, but the presence of external links and the phishing/trojan detection point towards a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=beatles+complete+lyrics+pdf
    • https://cdn-cms.f-static.net/uploads/4467564/normal_604b24fcae284.pdf
    • http://pobesegu.scienceontheweb.net/cbse_syllabus_for_class_9_maths.pdf
    • https://cdn-cms.f-static.net/uploads/4496815/normal_602a55256bcaa.pdf
    • https://cdn-cms.f-static.net/uploads/4492253/normal_602c0a1b047f3.pdf
    • https://static.s123-cdn-static.com/uploads/4381108/normal_5ff9175a10b81.pdf
    • https://static.s123-cdn-static.com/uploads/4422150/normal_5fef37f0481d8.pdf
    • https://cdn-cms.f-static.net/uploads/4409610/normal_5fd89a855ef60.pdf
    • http://lomigakorak.getenjoyment.net/what_elements_can_potassium_bond_with.pdf
    • http://mavogevuz.getenjoyment.net/gusunadejumogobazutofa.pdf
    • http://vevaxogejaz.scienceontheweb.net/ancient_magus_bride_chise_voice_actor.pdf
    • https://static.s123-cdn-static.com/uploads/4383444/normal_60081c2fc3362.pdf
    • https://static.s123-cdn-static.com/uploads/4371495/normal_5fe5ef105971d.pdf
    • https://static.s123-cdn-static.com/uploads/4389821/normal_5ff8a2f70f167.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_286ee76ba0964a868a1b939bd61d6088.pdf?index=true
    • https://s3.amazonaws.com/mejigavukolu/six_easy_pieces_essentials_of_physics_explained.pdf
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_b4f9f620c2dc411d8aacfa61e66d766e.pdf?index=true
    • https://s3.amazonaws.com/tugumeb/antimicrobial_agents_review.pdf
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_25b42a99134341cc9786000cf71b5c42.pdf?index=true
    • https://s3.amazonaws.com/lolijexejomak/irregular_verbs_exercise_4_answers.pdf
    • https://s3.amazonaws.com/dukavunivifa/zumowuxobanuwewap.pdf
    • https://s3.amazonaws.com/zamemigojat/17421977790.pdf
    • https://s3.amazonaws.com/rizezobabub/eaza_callitrichid_husbandry_guidelines.pdf
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_881ff4adcfc84d399ce8463ad6ba5034.pdf?index=true
    • http://lafagelupuf.myartsonline.com/59423524752.pdf
    • https://s3.amazonaws.com/ropidadegaxut/ge_service_repair_number.pdf
    • https://s3.amazonaws.com/juzinaramip/66943156684.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_off0000fd2d.bin
fcfbe7aef077fad8f0bac82362ec427945dcb445319db9ef67182a577bd88603		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 5452 bytes
font_01_sfnt_off00010fa7.bin
17115cbd8dc0c72e0f2eab2d07f76cda6cce67c010356a8d69e852b97c8e4430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 11084 bytes

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