Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe3cbdf7cc762b4…

MALICIOUS

PDF

101.1 KB Created: 2021-04-29 05:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae2394f52d09eec1b6e4f9752e679052 SHA-1: ad2dfd0b70b6de71452fcbe55caf25b0bcece576 SHA-256: fbe3cbdf7cc762b44e9a24290d41646d0957804862b436d6d2c7fbb5498ca788
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or utilize UTM parameters, indicating a phishing or link-farming scheme. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=amor+y+respeto+matrimonio
    • http://jobediniberine.scienceontheweb.net/10th_english_book_guide_download.pdf
    • http://mewudaguzexo.sportsontheweb.net/93191702270.pdf
    • http://netewe8.xyz/islands_fine_burgers_menu_pricesk143d.pdf
    • http://forisawidokomor.sportsontheweb.net/brazilian_portuguese_course.pdf
    • http://pushbiz.fun/beats_studio_3_owners_manualkx2dy.pdf
    • http://eeeeeyyy.space/mor_sansar_ma_cg_video_download_pagalworldll6v1.pdf
    • https://cdn.sqhk.co/serodozire/Zgjjdib/94801972278.pdf
    • http://kesisofawa.mygamesonline.org/medical_fitness_certificate_format_for_school_admission.pdf
    • http://winoraama.website/vintage_race_car_games_for_nintendo_switchi51ce.pdf
    • https://cdn.sqhk.co/bewewojiwo/sie5ogj/vepekekemimozoke.pdf
    • http://gk-kuban.ru/59492751530m7xbw.pdf
    • http://nolesed.22web.org/graphic_design_interview_questions_answers.pdf
    • http://form-lnstagramverifiedbadges.com/158715266707hpzc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vebusatoro.atwebpages.com/mosaici_aquileia.pdf
    • http://sebokegekesuded.atwebpages.com/avent_steriliser_descaling_instructions.pdf
    • http://nuluwajewugutik.onlinewebshop.net/mumokudaruwaruta.pdf
    • http://fozabenisos.epizy.com/gakinusebalokiwotijapipo.pdf
    • http://zaduzos.myartsonline.com/definition_of_business_research.pdf
    • http://taperimogitunal.epizy.com/guwaburojatonatirede.pdf
    • http://tiliwadovi.epizy.com/accountant_cv_format.pdf
    • http://fewabob.rf.gd/95320636998.pdf
    • 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_off00014bf3.bin
3f337e993189508662328cd69dd853171f60d52ef0ece18575ba85ecb6b1ab7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF3 5024 bytes
font_01_sfnt_off00015cfc.bin
6ca937f4fd69343b30d8b1b44c995084a07bf7b54d13bcc0642e799db844028d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFC 12460 bytes

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