Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29b437361f424a9…

MALICIOUS

PDF

74.1 KB Created: 2021-03-28 23:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a818ab93125b814519598b0d002944de SHA-1: 7df512e718f917ac6c095826c23671b4352ed2ef SHA-256: f29b437361f424a95780b52ef596578faf28e923b49680a7c75910f47060bfac
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic identified it as a link farm. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to a malicious site, likely for phishing or to download further payloads.

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://pelibifir.ru/award?keyword=cours+analyse+2+smpc+pdf
    • https://cdn-cms.f-static.net/uploads/4445341/normal_6046804448f23.pdf
    • http://pegijegur.mygamesonline.org/does_my_vizio_have_screen_mirroring.pdf
    • https://cdn-cms.f-static.net/uploads/4378608/normal_605a24ee5af8e.pdf
    • http://mitutepoka.medianewsonline.com/ansi_code_for_relay.pdf
    • http://wejuveziwep.mypressonline.com/affidavit_of_support_form_i_864.pdf
    • http://texno3ua.com/where_can_i_watch_less_than_zeroudled.pdf
    • https://cdn.sqhk.co/mofijovelu/dZomQEo/best_captions_for_fb_pics.pdf
    • http://gramnews.xyz/xovorazipadigujq0nc1.pdf
    • https://cdn.sqhk.co/tisufupujeli/eme1vnY/steamboat_springs_colorado_map.pdf
    • http://zdorovie-vashe-vse.xyz/sally_house_on_mango_streetz6ce1.pdf
    • https://cdn.sqhk.co/gobajejuz/hcOijw5/disney_store_customer_service_jobs.pdf
    • http://qrastenmap.online/moto_x3m_bike_race_game_download_apkpure5sxdv.pdf
    • http://tesekal.mygamesonline.org/6600650873.pdf
    • https://cdn.sqhk.co/poxosafixe/arjiIws/eolien_offshore_le_treport.pdf
    • https://cdn-cms.f-static.net/uploads/4484610/normal_605798eecec96.pdf
    • http://particulier-societegenerale.xyz/physics_equation_cheat_sheetpzj2b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_3c597377dafe41cc9e66a68e482fd25c.pdf?index=true
    • http://lepugip.epizy.com/death_note_movie_netflix_soundtrack.pdf
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_5eaf56774b9b4b23b3e16191bb503051.pdf?index=true
    • http://mogewatiside.epizy.com/31082362093.pdf
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_205e796d55af40b6b7c1d7d998bdec69.pdf?index=true
    • 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_off0000e0d4.bin
cc82f33d6fbd343d98c1d698bdd9ba7c2248f5bf9cfd44c2a2964f0c8a83a5de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 5440 bytes
font_01_sfnt_off0000f345.bin
94786edeb94d9ecd3587ccfe06a29017052ce114192d290836c7a4247d8da731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 12072 bytes

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