Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b7f506d94bdd1f…

MALICIOUS

PDF

74.8 KB Created: 2021-03-14 10:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c83ea4e33a4f023e81ee13517953bdc5 SHA-1: 9f58a162c7dd30583367dc48d65f868be1c3b50d SHA-256: 30b7f506d94bdd1f5b85c5125e596e71e6649c007a9d02effaa2d3c179f22376
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. One prominent URL, 'https://seumenha.ru/wix?keyword=double+spring+pendulum+lagrangian', suggests a deceptive lure related to scientific topics to attract clicks. The ML_NYX_PDF_MALICIOUS and ClamAV detections confirm its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=double+spring+pendulum+lagrangian
    • https://cdn-cms.f-static.net/uploads/4375088/normal_5fd916174052d.pdf
    • https://cdn-cms.f-static.net/uploads/4486199/normal_602559596d38e.pdf
    • https://cdn-cms.f-static.net/uploads/4410211/normal_601fe2705dd99.pdf
    • https://cdn-cms.f-static.net/uploads/4451760/normal_604a93f371110.pdf
    • http://online-bestshop.xyz/22447360781tv70r.pdf
    • https://cdn-cms.f-static.net/uploads/4371523/normal_6028ab880d5fd.pdf
    • https://cdn.sqhk.co/wazewiput/jdyIiad/communications_plan_template_nhs.pdf
    • https://cdn-cms.f-static.net/uploads/4411229/normal_60396f221f13a.pdf
    • http://xapowuxif.mywebcommunity.org/xabirexaw.pdf
    • https://cdn-cms.f-static.net/uploads/4471960/normal_6041f005dff8f.pdf
    • https://cdn-cms.f-static.net/uploads/4417809/normal_6047810e6f05a.pdf
    • http://sushibara.net/terraria_join_via_steam_lost_connectionh5qyd.pdf
    • https://cdn-cms.f-static.net/uploads/4457582/normal_60491d00d8ad5.pdf
    • https://cdn.sqhk.co/zopezepazedo/eicYrir/kaxikekinis.pdf
    • http://inertbhjbj.ru/pharmacology_book_for_nurses_20207rd3r.pdf
    • http://rokuboxajiga.medianewsonline.com/35253660561.pdf
    • http://jijomaj.getenjoyment.net/miganijesunag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_eaebac87d7744d25b62de7e9fe305177.pdf?index=true
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_266f529b4d964322ad7d4772981fb1f5.pdf?index=true
    • http://roxujewov.myartsonline.com/mitigos.pdf
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_acbaf2e80bf046239979565b2fbc991f.pdf?index=true
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_240beb99203742f29b427040a2c74a50.pdf?index=true
    • 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_off0000e5b8.bin
112cb9fb887cf142222ee11f5ead4f30d1a4e78c6d147ec49d8606a4e8426ceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B8 5416 bytes
font_01_sfnt_off0000f805.bin
fa3acded569bf6f8ffb19db7ab84c768fbb63112d802fe476865372e64439827		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 11032 bytes

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