Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd939c597093c43d…

MALICIOUS

PDF

97.2 KB Created: 2021-04-10 17:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7c68d9f091c62af057aa8229796fd39 SHA-1: 7a9b676b762d13798d31eeb4ad8a3ace6408c513 SHA-256: bd939c597093c43d940c8fef674e5a98c3c2229bcd242aca59b0520ccd6938aa
156 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to PDF files, suggesting a link farm designed to redirect users to malicious sites. The primary URL, https://dafemum.ru/strik, is likely part of this distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=safety+first+images+free+download
    • https://static.s123-cdn-static.com/uploads/4497638/normal_6001104d79f6b.pdf
    • https://static.s123-cdn-static.com/uploads/4481990/normal_5ff08ccd3161c.pdf
    • https://dusitibepilezu.weebly.com/uploads/1/3/1/4/131437978/9102312.pdf
    • https://cdn-cms.f-static.net/uploads/4386330/normal_60359bba5d8b9.pdf
    • https://cdn-cms.f-static.net/uploads/4403822/normal_6063594e11170.pdf
    • https://cdn-cms.f-static.net/uploads/4388282/normal_6062595934b68.pdf
    • https://static.s123-cdn-static.com/uploads/4374521/normal_5fed077e8ee80.pdf
    • https://cdn-cms.f-static.net/uploads/4406514/normal_602c2f3f442bb.pdf
    • https://cdn-cms.f-static.net/uploads/4450907/normal_603e6a63ca077.pdf
    • https://cdn-cms.f-static.net/uploads/4467287/normal_604a7d213cb3c.pdf
    • https://bisaderivulele.weebly.com/uploads/1/3/4/7/134744485/2b471d0f44.pdf
    • https://vukasusig.weebly.com/uploads/1/3/4/3/134349680/8483489.pdf
    • https://mitigovoponezix.weebly.com/uploads/1/3/4/3/134375948/40e6025a00f3.pdf
    • https://cdn-cms.f-static.net/uploads/4494891/normal_601385872986c.pdf
    • https://cdn-cms.f-static.net/uploads/4385413/normal_603bdd5f8e434.pdf
    • https://mosivupidener.weebly.com/uploads/1/3/1/6/131637589/6652943.pdf
    • https://cdn-cms.f-static.net/uploads/4376856/normal_603782c02e785.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e1256736-95fe-4801-9d69-637757ec25a1/26313687397.pdf
    • https://s3.amazonaws.com/lawakux/why_is_the_bible_not_in_chronological_order.pdf
    • https://s3.amazonaws.com/fupanabivote/libro_caballo_de_troya_leer_gratis.pdf
    • https://uploads.strikinglycdn.com/files/d86e607b-c553-4f05-a2fd-29d700117501/does_anyone_take_expired_car_seats.pdf
    • https://s3.amazonaws.com/saziwijaxodav/11843135496.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_off0001421f.bin
8f6f13bd05abcb82096e654c8b658a11310fccf89ff6b4820aca15bbf9b8b02f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1421F 5524 bytes
font_01_sfnt_off000154e8.bin
b2447c1a6de64335ebdfb9a48a7ae0033d332997010316ab8b66c849841b8857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154E8 9864 bytes

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