Malicious PDF — malware analysis report

Static analysis result for SHA-256 024c129d015388e9…

MALICIOUS

PDF

74.7 KB Created: 2021-03-29 00:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f1dce2dce771efb41fd7bab0e1cd96a3 SHA-1: aeb1799743e70f3c1cc220671c9d5fc889aadcc0 SHA-256: 024c129d015388e99a2906c4be751c867f89c6afbd09a66fdc7d288d24b639a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/123?utm_term=gastritis+cronica+sintomas+pdf PDF link annotation
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/gididusipusu.pdfIn PDF document text
    • https://bununijadepijag.weebly.com/uploads/1/3/5/2/135298825/2334837.pdfIn PDF document text
    • https://cdn.sqhk.co/jawefujivi/hedieA5/38219377202.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/plot_summary_of_the_pit_and_the_pendulum.pdfIn PDF document text
    • https://gulezawajure.weebly.com/uploads/1/3/1/8/131858287/3a919.pdfIn PDF document text
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/7878156.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/jijdfnz/65746404395.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/hbgg8if/infinity_war_smash_bros.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/gjxk8rC/giwakapidofuvuno.pdfIn PDF document text
    • https://cdn.sqhk.co/laloropaki/m0efggN/shogun_hibachi_menu.pdfIn PDF document text
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/jarefovonidop-fakafip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zapofekeba.rf.gd/74051373697.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/gcse_history_revision_guide.pdfIn PDF document text
    • http://fegozovot.rf.gd/marksheet_loan_finance_company.pdfIn PDF document text
    • http://rabudigika.rf.gd/64857515015.pdfIn PDF document text
    • http://pinopog.rf.gd/85611897633.pdfIn PDF document text
    • http://kazaxeso.rf.gd/gitiwekokavapazixibefe.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/middle_adulthood_physical_development.pdfIn PDF document text
    • http://jijutinu.epizy.com/4341904416.pdfIn PDF document text
    • http://nifusotajezunur.atwebpages.com/alimentos_ricos_vitamina_c.pdfIn PDF document text
    • http://tetaduzebeturap.rf.gd/bubbler_system.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/stihl_ts_420_user_manual.pdfIn PDF document text
    • http://zonurupadul.atwebpages.com/waboraxujojalunivugewoson.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 5300 bytes
SHA-256: 8611f6dc30999a77537dc139004a750da75f660c7c27f148ae08eb77a7115e72
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 11972 bytes
SHA-256: 556ca8724cc9cc08b55953c65496a5de222566f01580bbd9c2c19b840f77d319

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