Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3a0dc130702287…

MALICIOUS

PDF

80.5 KB Created: 2021-04-17 20:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc44f8343c9eeecacfb6b93acb495562 SHA-1: 22f5f07def52b7da6f6c01771c846898e5228980 SHA-256: 9f3a0dc130702287e44a06832dc20d2273663e40829cb15b565a9680a8e80376
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely to facilitate phishing or malware distribution. The embedded URL 'https://seumenha.ru/strik?utm_term=glencoe+geometry+6-3+study+guide+and+intervention+tests+for+parallelograms' further supports this, as it appears to be a lure disguised as a study guide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=glencoe+geometry+6-3+study+guide+and+intervention+tests+for+parallelograms
    • https://cdn-cms.f-static.net/uploads/4530910/normal_5fd66e2cd6bef.pdf
    • http://francobusiness.com/how_to_deal_with_extreme_interview_anxietyrc53g.pdf
    • http://detonic-italy.website/78435091198hu2wi.pdf
    • https://cdn.sqhk.co/buvaboda/RijigoE/download_game_micro_machines_v4_pc.pdf
    • https://cdn-cms.f-static.net/uploads/4413011/normal_602199407c020.pdf
    • https://cdn.sqhk.co/negolura/7Gibjh2/teaching_strategies_creative_curriculum.pdf
    • https://cdn.sqhk.co/kozuvurop/T3S4yWG/88845505448.pdf
    • https://cdn.sqhk.co/jutalufelex/Hbidigr/1917730731.pdf
    • https://cdn.sqhk.co/kajipazuto/kig6yjd/space_captain_galaxy_shooter_apk.pdf
    • https://cdn.sqhk.co/vemupanilow/diajejh/space_attack_space_shooter_lyrics.pdf
    • https://cdn.sqhk.co/gegatuzikat/jbygihb/lock_screen_reset_password_not_working.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_d3ac34addd9a4f76a3674e76420a910a.pdf?index=true
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_f2a663adbe2840fab258e4d2cc8e10ec.pdf?index=true
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_007674eb5b2a4f6e8469f1b582491c07.pdf?index=true
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_56524abbe5a3463bbab164e32d1604cd.pdf?index=true
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_93946dca9b4b41e48ff47ff263c4d1be.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e4153920-f5dc-4b25-8575-037df5f02021/you_have_been_asked_to_draft_a_document_related_to_evidence_gathering_that_contains_details.pdf
    • https://uploads.strikinglycdn.com/files/ce57c14f-621a-4add-b96a-1557ec4d3d2f/dbt_transaction_means_in_hindi.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_off0000f68c.bin
bfc5cacb83576a8e4a27401e222b5cbb5257b5b2d0ffe49d8b958685234f9259		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 6016 bytes
font_01_sfnt_off00010b0d.bin
c8049c5fca6a6613593e02194bc4746831195931200998d13d9b59218ff24f68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 12392 bytes

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