Malicious PDF — malware analysis report

Static analysis result for SHA-256 88585f702c2409c7…

MALICIOUS

PDF

78.3 KB Created: 2021-03-15 18:10:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c190b414092d9636e4b0097b22676d9 SHA-1: 2baaa631393067729bb13cf55617aa3ecdcdfcb1 SHA-256: 88585f702c2409c76ec8e592c6486c3747fe18e63e52b407ffc23fd800e0f77a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=omron+h3cr-f8n+manual
    • http://sysfix.ru/addition_and_subtraction_of_fractions_or_mixed_numbers_with_unlike_denominatorscmrjy.pdf
    • http://makebugobiwuka.mypressonline.com/the_twelfth_planet_audiobook.pdf
    • http://b0xberry.online/47267547472dsayg.pdf
    • http://get3creditscores.info/88721412494whtzi.pdf
    • http://jobediniberine.scienceontheweb.net/vizagebutelet.pdf
    • https://static.s123-cdn-static.com/uploads/4366003/normal_5ffeb32edb382.pdf
    • https://static.s123-cdn-static.com/uploads/4446782/normal_5fdfdbffaca10.pdf
    • http://dosijefa.mypressonline.com/medical_spanish_interpreter_certification_washington_state.pdf
    • https://cdn-cms.f-static.net/uploads/4417030/normal_5fd999c18987f.pdf
    • https://cdn-cms.f-static.net/uploads/4402504/normal_601f27439e22a.pdf
    • http://gukiduwonaxinef.getenjoyment.net/98359057569.pdf
    • https://static.s123-cdn-static.com/uploads/4443578/normal_5ff0a82ed0332.pdf
    • https://cdn-cms.f-static.net/uploads/4449973/normal_5fd648cf9fb38.pdf
    • http://hdvideo.design/31744428998nkl34.pdf
    • https://static.s123-cdn-static.com/uploads/4486987/normal_5febb280ccc4a.pdf
    • https://cdn-cms.f-static.net/uploads/4368265/normal_60401bb2c6f9c.pdf
    • http://nufapivevavenak.22web.org/wesevaxidekodudosafimebov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://saboveliga.myartsonline.com/pharmacist_experience_certificate_sample.pdf
    • http://xojaxuvepe.epizy.com/38786068868.pdf
    • http://difugarulid.epizy.com/cute_cat_sound_ringtone.pdf
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_a2c3f48e6f0d4460a11cf689963d1c15.pdf?index=true
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_64804214daad4183b4ac6861f347bea6.pdf?index=true
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_4828da9df5904e329b0e86702a1cefc2.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_off0000f2a4.bin
ad8e7012c27df5bbf3914de1b8c8f495ac0e2a89bbb07abd47b9a8483028719f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 5360 bytes
font_01_sfnt_off000104c0.bin
a59ba45ffc47886616da458f3b13878010064c40f549108fb7d80ed4cd378186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 11372 bytes

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