Malicious PDF — malware analysis report

Static analysis result for SHA-256 e129daf89f7f3bad…

MALICIOUS

PDF

70.0 KB Created: 2021-02-18 22:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8ad9f94058f9dbe3d0c4c18a3505f16e SHA-1: 555392fc96204fedb4757358c28db086f70d3cad SHA-256: e129daf89f7f3bad9184e51a19c60199afa6b05fe472fe25b15aedeff8213800
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document is designed to trick users into installing a fake browser extension or update, a common tactic for credential theft or malware delivery. The numerous external URLs, including one pointing to 'jacksth.ru', likely serve as landing pages or download sources for the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jacksth.ru/123?utm_term=what+mystery+does+the+myth+of+pandora%2527s+box+explain+walk+two+moons PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495050/normal_5fd9aabfaeb46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_6011dbe6bc781.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/hejNia8/pemije.pdfIn PDF document text
    • https://mowazaxof.weebly.com/uploads/1/3/4/7/134704653/3217834.pdfIn PDF document text
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/gejulebevuj-xeduv.pdfIn PDF document text
    • http://eurofamily.pro/goluluriguxl1.pdfIn PDF document text
    • http://dukovasupufe.iblogger.org/84203065258.pdfIn PDF document text
    • https://vevuduwas.weebly.com/uploads/1/3/0/7/130775740/1062042.pdfIn PDF document text
    • https://cdn.sqhk.co/senepaderu/ghjjahc/the_triple_crown.pdfIn PDF document text
    • https://cdn.sqhk.co/zewawugawa/L0hgIyr/22920350583.pdfIn PDF document text
    • http://greenbike.shop/mewirewopprew6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465000/normal_6010a1544d1a6.pdfIn PDF document text
    • https://cdn.sqhk.co/zajikeze/iihbgjq/mcdonalds_breakfast_hours_start_time.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_6027571883deb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nomapalugaji.epizy.com/alvida_alvida_noha_mp4.pdfIn PDF document text
    • http://pobevezegudam.epizy.com/android_developer_settings_night_mode.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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 5792 bytes
SHA-256: f06e61645a3e280846a4e91ff0f22b3aa50dc5b127dd066f8e75e4bf066d22d0
font_01_sfnt_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 10456 bytes
SHA-256: b2e637a60ab85b4f6d1d2264ae759bd1172e0f31acff63dfb7625efb109bc739

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