Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cadbb48e985780e…

MALICIOUS

PDF

75.2 KB Created: 2021-03-30 00:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: b86ad64e3121d09f4037d0943c54c342 SHA-1: ed90843ab3d495104b5339a8ceea252e1918d182 SHA-256: 1cadbb48e985780e0e90e1cfb9179129f711b0e6de894f7fc24960e62ab35cf6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/wix?keyword=trinity+research+group+dothan+al PDF link annotation
    • https://cdn.sqhk.co/savageven/gev6b6u/fiwovunikoraxalewozi.pdfIn PDF document text
    • http://doweryklkq.space/dutiwetezidasizic94x.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/dhg1jb4/gazukojilimu.pdfIn PDF document text
    • http://viwowiziboso.22web.org/types_of_isomers.pdfIn PDF document text
    • http://hurricane1.space/workpro_quantum_9000_manualkqyfy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_60281951d7ea5.pdfIn PDF document text
    • http://sberbank.services/pababexidi2kd71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_602a34d4ac091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496592/normal_6022e6b2447ea.pdfIn PDF document text
    • http://shoes-storie.club/geoffrey_broadbent_design_methods_in_architecturel9g2p.pdfIn PDF document text
    • http://putijeku.22web.org/fundamentals_of_t_sql.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/6ygcjij/alter_ego_clothing_waist_trainer_reviews.pdfIn PDF document text
    • http://salet.store/85674161317wlkdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwuwilanu.epizy.com/nevapo.pdfIn PDF document text
    • http://dijunegibo.epizy.com/14258948347.pdfIn PDF document text
    • https://369206df-e466-4f8f-9771-850d1edb33c5.filesusr.com/ugd/8fd5dc_1f16c657b48747c9a3211f0e3415a939.pdf?index=trueIn PDF document text
    • http://kedixiravupit.epizy.com/alibaba_aur_40_chor_1980_movie.pdfIn PDF document text
    • http://kebafitesulodu.epizy.com/79697283116.pdfIn PDF document text
    • http://limepupotof.epizy.com/18425224420.pdfIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_f8571b833f924de08aeceebe160cd438.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE922 5388 bytes
SHA-256: 37ce66faf5c6ef0cf7f7d17803336a2385e4f2474e897e4510c371fb3d5e0a35
font_01_sfnt_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 10672 bytes
SHA-256: 832bcb7f300f9a93de414e113dbc46006a7205e8905ff17d83683ecc2cf866b7

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