Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89ef4b4db77266e…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 21:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bbb678de2531399550329b0102e0c3c SHA-1: 5c02d013b25c12d4bcb59f4d27e28ea1dea93aa5 SHA-256: c89ef4b4db77266eef627dc31bda48adc2be8da148234f20ae8e497b09fe5242
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('ponafet.ru') and another using a URL shortener ('cdn.sqhk.co'), suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://ponafet.ru/123?utm_term=ratio+analysis+sample+questions+and+answers
    • https://cdn.sqhk.co/fagisuxupinu/5hhghgB/sebagabefuvetafatu.pdf
    • http://pikawufugaxoz.22web.org/difference_between_assembler_compiler_and_interpreter.pdf
    • https://cdn-cms.f-static.net/uploads/4463279/normal_60139573a67f0.pdf
    • http://itravelgr.com/bmw_e90_automatic_to_manual_conversion4gszn.pdf
    • http://basepati.22web.org/internet_manager_version_6._35_crack.pdf
    • https://cdn-cms.f-static.net/uploads/4420760/normal_6014b21d79ecb.pdf
    • http://luxshop21.site/51665785418yu39p.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://bezprovodov.guru/shadowrun_6th_edition_character_creationtqp9t.pdf
    • https://cdn-cms.f-static.net/uploads/4467277/normal_6026091ad6fa3.pdf
    • https://static.s123-cdn-static.com/uploads/4379626/normal_5ff060eeba41c.pdf
    • http://wdd13.ru/41592420950g47ja.pdf
    • https://cdn-cms.f-static.net/uploads/4446930/normal_6041f4d4d4e80.pdf
    • http://kilubome.iblogger.org/ecco_guidelines_ulcerative_colitis.pdf
    • https://cdn.sqhk.co/kidimezamos/KijXxic/evacuees_meaning_in_bengali.pdf
    • https://cdn-cms.f-static.net/uploads/4461767/normal_5fd1a65d75c75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ruzupaxenerod.epizy.com/fire_truck_toddler_bed_sheets.pdf
    • http://kagadagofos.epizy.com/doa_surat_yasin.pdf
    • http://nonogopikizezed.rf.gd/biophysics_textbook.pdf
    • http://tatifamajerub.epizy.com/china_visa_application_guidelines.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed48.bin
68cdb68611f4a863a2b4e11bf9f223719e516a4b909333d4eb74dd6e7e4b5a4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 5432 bytes
font_01_sfnt_off0000ffc7.bin
640d5d131cd4b8407383ebe88629131f323a949546d37ad42ce0915a5299adbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 10620 bytes

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