Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeebd480df1bd0fa…

MALICIOUS

PDF

87.0 KB Created: 2021-03-18 00:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 077a8114e55c35e57b6ad84fd72af48a SHA-1: e7710470d4c60924694aff02c476929a501e0901 SHA-256: eeebd480df1bd0fa9c668570d5d45c37af6b9b4fe64eb786f4b4e8ee6abeaea2
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least two pointing to potentially malicious or link-farming domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true destination by using multiple disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/123?utm_term=applications+of+python+programming+pdf
    • http://tusetametepem.22web.org/73672058130.pdf
    • https://cdn.sqhk.co/zumedizojas/jhGXEwi/wheel_of_fortune_game_3_players.pdf
    • http://gezoxapawelu.22web.org/murojowerowonuda.pdf
    • http://bikejesoxatelo.mygamesonline.org/wd_my_cloud_ex2_firmware_update.pdf
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5fd646dc4c35c.pdf
    • https://cdn.sqhk.co/pufuxogife/SS0Mjbn/horse_jumping_simulator_game.pdf
    • http://gemubanabugawa.mypressonline.com/fiwipifawugowatoga.pdf
    • https://cdn-cms.f-static.net/uploads/4478383/normal_60184ba0eccf0.pdf
    • https://cdn.sqhk.co/zenokosix/hjzZp3G/leather_jacket_with_fur_hood_mens.pdf
    • http://jisutuxoxaza.medianewsonline.com/tomakatukujexaforet.pdf
    • https://cdn-cms.f-static.net/uploads/4496374/normal_603d2d79cad54.pdf
    • http://kawafopi.mygamesonline.org/natural_selection_lab_phet_simulation_worksheet_answers.pdf
    • https://cdn.sqhk.co/fedovusig/9v6MMij/62757980184.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ditanumugagoma.myartsonline.com/kumon_books_for_grade_2.pdf
    • http://jupegojut.atwebpages.com/reacciones_de_alcanos_ejercicios_resueltos.pdf
    • http://xokovuwewa.epizy.com/alan_watts_out_of_your_mind.pdf
    • http://xamunenefo.rf.gd/renaissance_periodization_powerlifting_strength_template.pdf
    • http://gegurobaz.myartsonline.com/savikigosi.pdf
    • http://movuzawizigevej.myartsonline.com/adventurers_league_character_sheet.pdf
    • https://s3.amazonaws.com/biwubeleba/20951206227.pdf
    • https://s3.amazonaws.com/jejulurowev/fatezulililov.pdf
    • http://girifatu.rf.gd/61590262762.pdf
    • http://ziwivazud.onlinewebshop.net/nikon_l35af_af_review.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_off00011659.bin
02a835d420900adab8a8a99aa4ff41e84d68c191b998807d4096d204f426ccd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11659 5660 bytes
font_01_sfnt_off00012977.bin
603c561b16ccd5dd536a4929cbc0c27523d54548234aff32d31d1b20296d83ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 10916 bytes

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