Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e5b3af735d9660…

MALICIOUS

PDF

77.0 KB Created: 2021-03-02 01:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a3c462c5c9872dad9da28101ed2c08c2 SHA-1: 933a94b62f23db023ec7270adcb08e3af3d47e9c SHA-256: e8e5b3af735d9660027e2d200cde53389c453fd3df3d9d8b390da46af9a528a9
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 0.9997

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://jacksth.ru/strik?utm_term=sports+illustrated+cover+2020+transgender PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408464/normal_5ff25e6937108.pdfIn PDF document text
    • http://kprovk.xyz/septic_tank_inspection_report_formy047q.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/how_to_fix_a_noisy_insinkerator.pdfIn PDF document text
    • http://menesoger.iblogger.org/45101279578.pdfIn PDF document text
    • http://goodik.fun/memories_of_the_alhambra_guitar_musica0ryu.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/why_does_polar_attract_polar.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/5cZieih/active_site_residues_of_protease.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/Hjh77jc/new_england_hiker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibejodawugizex.rf.gd/full_form_of_atm_in_computer_networking.pdfIn PDF document text
    • http://wukazenavezexeg.rf.gd/12836420920.pdfIn PDF document text
    • http://dexedigobejo.rf.gd/nuzibadusex.pdfIn PDF document text
    • http://tatefubuzu.rf.gd/how_to_use_num_solve_on_ti_36x_pro.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_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 5676 bytes
SHA-256: d56920bc9f1df8c9958f5468b266bbe1e1cdf26ff5cfeb02a37db03a5220abe8
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 1864 bytes
SHA-256: da5e1271ff170ab1d1050da3d3d2ed1187ee066e5f9fbe2f6b2894ea2e7db3c6
font_02_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 11304 bytes
SHA-256: d1bacded4b91507e3a8d37aeb85a29980915d322daf0582956495b7b6e587d55