Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4fcfd5b2cf87ad…

MALICIOUS

PDF

81.2 KB Created: 2021-03-15 08:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a4f808c61096b57d91b3f3e7a8d130c1 SHA-1: aec2e54f92212b2873d4e30b76570d5a8b68cc6e SHA-256: eb4fcfd5b2cf87ad4a4c8d0fdb6ded69bcb6a50ba4c2e84e242d4f6d39fb9cbc
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to external domains, suggesting a primary function of redirecting users to potentially malicious websites. The presence of external URIs and link farm characteristics indicates an attempt to distribute content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/award?keyword=artritis+reumatoide+pdf+elsevier+2020 PDF link annotation
    • http://lololoj.sportsontheweb.net/logitech_z-5500_reset_control_pod.pdfIn PDF document text
    • https://cdn.sqhk.co/nudogada/cPWheys/58504607546.pdfIn PDF document text
    • http://infonewstravel.com/67529417432frh8u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388165/normal_5fc9a3615a1b1.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/40tMpyd/silicone_car_gear_shift_knob_cover.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_604ef4d516638.pdfIn PDF document text
    • http://zetumitufam.mywebcommunity.org/keluxinapetobujakidalowoz.pdfIn PDF document text
    • http://ductsunlimitedins.com/cassius_dio_roman_history_loebd2o7d.pdfIn PDF document text
    • http://muldwych.com/wavodukevg5xum.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/NHigwhj/home_gym_assembly_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421478/normal_6027e5d78250f.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/what_size_tires_are_on_a_2005_chevy_equinox.pdfIn PDF document text
    • http://domainlimax.xyz/34902303421as4sy.pdfIn PDF document text
    • http://ergors.space/archimate_3._0_templatesxro1x.pdfIn PDF document text
    • http://activa-fb.com/48423372640gbt58.pdfIn PDF document text
    • http://1xbet-registr.site/senoridivula6dpbm.pdfIn PDF document text
    • http://lighttravel-ng.com/how_to_set_goals_for_your_sales_teami5qe4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/02d1bf25-ca60-4c0d-bdde-4c139bfc2063/lizuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc282c4a-c555-4180-be13-0a7b6e137504/mindfulness_coloring_book_free.pdfIn PDF document text
    • http://movuzawizigevej.myartsonline.com/31882325287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b826143-7223-4334-9204-7f3a09b7bf85/32598869389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ba88877-e9dc-4469-a44f-8e31d71c301d/sun_tzu_art_of_war_book_free.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_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 5508 bytes
SHA-256: 1a4521115c911b8dca005b8aaca5dc19824ac385890753606e2e615acc6ad9e5
font_01_sfnt_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 13360 bytes
SHA-256: 4a11702e2bd10197440d8fcdb37e8ac4c0c516ba2305c0188a8605c393a4dba6

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