Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ac63642ea052e1…

MALICIOUS

PDF

77.9 KB Created: 2021-03-28 18:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bc4c4dd03b12953e0f66e524f3ad3e30 SHA-1: 55e7cd4fddacbf5461e29f505173f1b81af2cf22 SHA-256: 71ac63642ea052e1bc625da55d5f8515f23cc6858df20600f3578e50d696651b
186 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to other PDFs. The ML classifier and ClamAV also identified it as malicious, likely phishing-related. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or for SEO spam purposes. The presence of many external links indicates a phishing or content-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://zajinet.ru/award?keyword=original+bible+pdf+download PDF link annotation
    • https://cdn.sqhk.co/rerunagakiz/Mjjggjd/6481775311.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/hg7npja/pasojosojamokinaxaxawod.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/pdf_markup_app_windows_10.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/sotura.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/jgwhcOv/55661813655.pdfIn PDF document text
    • http://milanomoda-italy.site/jinomukatozetojagadv5one.pdfIn PDF document text
    • http://futajef.medianewsonline.com/pdflatex_compile_bibtex.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/FIoihhf/celestia_ludenberg_figure.pdfIn PDF document text
    • http://lidzadva.xyz/8484338557ohlp7.pdfIn PDF document text
    • https://cdn.sqhk.co/nusatabi/x0FLQib/kill_creeper_command.pdfIn PDF document text
    • http://xewixejixukumes.22web.org/9968219479.pdfIn PDF document text
    • https://cdn.sqhk.co/sixojifez/Xj4uM97/zovepaborodoropegobonat.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
    • http://dunupilopun.epizy.com/balearia_ibiza_formentera_tickets.pdfIn PDF document text
    • http://newepizudef.atwebpages.com/wawizuxazevaxukiralubeku.pdfIn PDF document text
    • https://aaca6425-83b8-4992-a49d-2ec8a2d61848.filesusr.com/ugd/304e3c_95209190af744301ab6e69552f8640ff.pdf?index=trueIn PDF document text
    • http://sitafefisoju.atwebpages.com/sunbeam_heated_blanket_microplush_10_heat_settings_queen.pdfIn PDF document text
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_ddce2b2dac2f4b1683936c31fbbc9a09.pdf?index=trueIn PDF document text
    • http://putawipomow.rf.gd/jasegigemijudot.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_10c78e651f4245b597c4d49fff1fbc4b.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_dac57525794240deae1acfe109c8878d.pdf?index=trueIn PDF document text
    • http://detuzepa.rf.gd/chemical_reaction_equations_introduction_answers.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_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 5000 bytes
SHA-256: 9889b92df7828a6c41c9e8ddf469c940371e685998f53eb395773ab43ecd6a99
font_01_sfnt_off0000f692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF692 11212 bytes
SHA-256: 16d277471685242ae0cbaf01dea6bd3531b1cf66c75f185fc8957ecaaac8c3fc
font_02_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2