Malicious PDF — malware analysis report

Static analysis result for SHA-256 b088bed293b7069c…

MALICIOUS

PDF

72.0 KB Created: 2021-02-27 19:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 306cea9fc032328ce35d0c08e0d12e81 SHA-1: 73ac91cbdd2338fe38a224f7e077d880f930d12c SHA-256: b088bed293b7069cbfb80af14df348f8b3262fff3baba887909e035398ee9d87
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan PDF. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=presto+cool+touch+electric+griddle+07030+parts PDF link annotation
    • http://bewewafip.scienceontheweb.net/can_american_wii_play_japanese_games.pdfIn PDF document text
    • http://7lessons.space/latest_android_ringtones_freewxvqz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421939/normal_5fdd8681b114c.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/michael_jordan_the_life_review.pdfIn PDF document text
    • http://rezotu.xyz/xenutodemimimafeqiycc.pdfIn PDF document text
    • http://begemotiks.space/airline_booking_system_gabriel_user_s_manual86s12.pdfIn PDF document text
    • https://sagagokibifaku.weebly.com/uploads/1/3/4/6/134625973/webaloboli_nuludom.pdfIn PDF document text
    • http://aviabileti.ru/522897690vk3ps.pdfIn PDF document text
    • http://zoomita.fun/25575631126hd73m.pdfIn PDF document text
    • http://hangzhoumetal.ru/5121170454lx2hv.pdfIn PDF document text
    • http://arenda-comp.space/farm_heroes_super_saga_levels_with_many_flowers085b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453909/normal_5ffcc90d793e6.pdfIn PDF document text
    • https://keboxineb.weebly.com/uploads/1/3/0/9/130969034/wafesupepojedosarus.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/6777877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464720/normal_5fd1e6c80d9f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_5fd6ac54efb4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 5724 bytes
SHA-256: 145310270d2a1c3766fa0a5d4615bd3a7856458ee40d75ad11c525c5455d011d
font_01_sfnt_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 11824 bytes
SHA-256: 64ab42df52de666cd8ccf59b79f35daf59f15098893cd4763f30812c636cf03c

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