Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9169ae4aabd2bc…

MALICIOUS

PDF

73.0 KB Created: 2021-02-14 17:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 018f39fb8916e6735bd1db143207aa52 SHA-1: 6f6ecea4da7d61393a36f1b60fbf4c84d1197e78 SHA-256: 8d9169ae4aabd2bcf1c8d8d85f7539a9b4ca59e640502e8d36e84f8e8ac3dd32
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

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://bologen.ru/wb?keyword=games%20%202018%203d PDF link annotation
    • http://sodamasagu.66ghz.com/template_banner_back_to_school_vector.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/ijePhhB/39246303631.pdfIn PDF document text
    • http://trokot-online.xyz/yuva_upanishad_computer_book_downloadxiius.pdfIn PDF document text
    • https://cdn.sqhk.co/wubukuxivupe/vTjfHhd/diesel_drag_racing_pro_best_tune.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/hfGYYjb/huey_p_newton_gun_club_houston.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/hNJjcgg/72860545807.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/ifhc8dL/mobile_arcade_soccer_league.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/hdjehcK/32785754479.pdfIn PDF document text
    • https://cdn.sqhk.co/nubenirosife/hbjjRja/twist_crossword_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/z86ijuU/gears_of_war_2_xbox_360_gameplay.pdfIn PDF document text
    • http://mazanatur.space/33529219988b8wm1.pdfIn PDF document text
    • http://guketaz.iblogger.org/71744075220.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/cMTgidr/mukewamalarunerigon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijazujarakowom.epizy.com/half_life_word_problems_worksheet_with_answers.pdfIn PDF document text
    • http://luwefotikejumu.rf.gd/lightning_crashes_chords_sheet.pdfIn PDF document text
    • http://bazogojuzularib.rf.gd/california_secretary_of_state_form_llc-_1.pdfIn PDF document text
    • http://visasefiji.rf.gd/kagaj.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_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 5556 bytes
SHA-256: 0e0f8a75db8a896f3611028a35cb71476257f31e6741c6abf8ccbc4039e16880
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 10492 bytes
SHA-256: f7e52ec33b82fa23cd2cfc5d4032b9c990b644d770223e2691d2e1c102a4ad7f

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