Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ab7320a99038e6…

MALICIOUS

PDF

98.1 KB Created: 2021-03-25 14:06:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 402fcb758b5afde4a5df07ce54ff9127 SHA-1: 2c9b7cecb3d92f0441172c0363d814b3e6443e30 SHA-256: 25ab7320a99038e6afa1b18fa59492ff1b3ece43217ecf5badc464e6998fabba
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary malicious URL being vilenefex.ru. This suggests the document's purpose is to redirect users to potentially malicious sites for phishing or further payload delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=marlin+60+sb+scope+mounts PDF link annotation
    • https://cdn.sqhk.co/nawovoso/2IgdmB3/afrikaans_is_groot_vol_8.pdfIn PDF document text
    • https://cdn.sqhk.co/muvasesuru/egjTQYh/nasemojajetafak.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/geometrical_isomerism_download.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/2001_honda_civic_transmission_rebuild_cost.pdfIn PDF document text
    • http://wadipogi.medianewsonline.com/41387544406.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/CjbjaIH/wellness_coach_app.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/g1gciia/ww2_flying_games_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_268a18881aa24e32b9d1dab2a420edda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/68746965382.pdfIn PDF document text
    • http://zevusup.atwebpages.com/19901338658.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/why_is_it_important_to_measure_absorbance_at_max.pdfIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_a095b467ce5b447db1b3071e722ef28f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falejogajir/fenaloneranativozizavad.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_3d5f0cf8fc4a445f81cc9527e9d88088.pdf?index=trueIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_71f4053b662648d19660cb620145c45a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/95013964386.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_627fc304716742c5b5866d15c1d89383.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_010dbe10656246aebeaeb2773548158f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/netupikisavaritidij.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/family_law_act_bc_child_support_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/nilosevuwomurikasakiv.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/australian_visa_form_1419.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C6 5400 bytes
SHA-256: 369db81e9f441c7d0f3e1feb524aee5addf8d43cd9ece4d9e83781a69e045029
font_01_sfnt_off000147f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F5 10872 bytes
SHA-256: 222a7ab226e50f83c1553bb810568a6c93984f1f1c92e23304fcd17852b9a1e0
font_02_sfnt_off00016d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D10 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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