Malicious PDF — malware analysis report

Static analysis result for SHA-256 adee0f1c58582aed…

MALICIOUS

PDF

143.8 KB Created: 2021-05-22 17:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a17d51f6b13a7da381e987995b49ce2f SHA-1: 69c392c8970919ed9d02931bd998efb7c7eb172a SHA-256: adee0f1c58582aedfeacc33ffdca5a1c7b1b2c79eaa0fe5068dedf92311175f9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, https://vilenefex.ru/strik, is likely used to host malicious content or redirect to a phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent.

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-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://vilenefex.ru/strik?utm_term=fate+grand+order+ascension+material+spreadsheet
    • https://nazutusimeraj.weebly.com/uploads/1/3/4/8/134883567/giwefafupuxa.pdf
    • https://static.s123-cdn-static.com/uploads/4458824/normal_5fc8ddfab3930.pdf
    • https://static.s123-cdn-static.com/uploads/4370266/normal_5fce95789a7ab.pdf
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/a54721891a4.pdf
    • https://xarutixusu.weebly.com/uploads/1/3/4/6/134699400/0bd64a.pdf
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/54e24521010b.pdf
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5fc7dcd67671f.pdf
    • https://static.s123-cdn-static.com/uploads/4371265/normal_5fcbfe1c81e59.pdf
    • https://dofewomal.weebly.com/uploads/1/3/4/5/134510420/6027149.pdf
    • https://rewudorabemomaf.weebly.com/uploads/1/3/4/2/134234845/wuzagajoz_wivuwezuz_guzumijorav_dowolebapodosoz.pdf
    • https://static.s123-cdn-static.com/uploads/4475854/normal_6008aa04e0c98.pdf
    • https://pixavegabub.weebly.com/uploads/1/3/5/3/135307945/komirojuwijem-buxifiji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/af76a63f-0925-4b09-8c95-f19dde8b5d9e/28941088453.pdf
    • https://uploads.strikinglycdn.com/files/65ab2413-0245-4638-820f-800dd6b264bc/93250680747.pdf
    • https://uploads.strikinglycdn.com/files/18a12940-bf0e-4f5d-bcdf-5aa789e2a933/how_much_do_you_get_for_maternity_allowance.pdf
    • https://uploads.strikinglycdn.com/files/dec14dc5-4e1c-4620-8d46-95bbab1d0c16/mole_concept_questions_class_10.pdf
    • https://uploads.strikinglycdn.com/files/71f5ad46-50e6-4744-aef2-59f593596bdd/jokuwafefofa.pdf
    • https://uploads.strikinglycdn.com/files/28f9ba5c-5c1f-4da7-8855-80bf5b6df9b8/dopidujote.pdf
    • https://uploads.strikinglycdn.com/files/c7becc95-9d70-49a4-9061-3f271dd985e1/prep_for_medical_assistant_exam.pdf
    • https://uploads.strikinglycdn.com/files/d3312733-518c-4faa-8edc-2bf2797c669b/88386329.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a833.bin
b0f0dd6c2514199a7546c64c2fe3d8c248a5109af6623e72af45c14d2f512d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A833 24960 bytes
font_01_sfnt_off0001f640.bin
c1a7358b483bb47f5628fbb5747616a5388b53ff9c5fb80fd5878ad401adb86d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F640 5444 bytes
font_02_sfnt_off0002089c.bin
c32167926b3a75035d93db448f70d811ef10b2516bbe1bb66a534c05514eaf7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2089C 11748 bytes

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