Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8535a1ece3a70c2…

MALICIOUS

PDF

82.7 KB Created: 2021-04-27 04:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a88b61eb88c71951c28d7809c5819b3b SHA-1: 6d9f2f8b1d5baa1bdbef46abc732c8bed13fee3a SHA-256: b8535a1ece3a70c27dfb4fab41c0487969edcb788e200a86540a1f9ad789e66f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('kuzutuzo.ru') that is likely part of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple PDF links, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

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://kuzutuzo.ru/strik?utm_term=kiss+the+rainbow+shop+discount+code
    • http://psylath.com/giraffes_cant_dance_activitiesw94bo.pdf
    • http://iciko.xyz/14954780190gtdin.pdf
    • http://wildber.store/dajabejopbea.pdf
    • http://talezoruvaje.iblogger.org/evaluating_variable_expressions_worksheet.pdf
    • http://216tilford.com/historia_de_la_geometria9c3mq.pdf
    • http://realwockyc.info/wings_of_fire_book_15_sneak_peekbwm3g.pdf
    • http://livecopyrightverification.com/1998_harley_softail_service_manualn7hxh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bevevekafoli.epizy.com/refudujamajif.pdf
    • http://xukulugix.rf.gd/autobiographies_download.pdf
    • https://s3.amazonaws.com/gavobawum/bedikewukirefodadumizoge.pdf
    • http://bojefej.epizy.com/solitaire_cube_classic_cards_apk.pdf
    • https://uploads.strikinglycdn.com/files/d6bc2144-2a77-4882-a117-2281aef91d10/sugar_detox_meal_plan.pdf
    • https://s3.amazonaws.com/kiremefegonar/jemuzinenopujijoxuronanur.pdf
    • https://s3.amazonaws.com/gewuwasi/ferowes.pdf
    • http://zadakirilavaru.rf.gd/rajigowufozumuxod.pdf
    • http://muxajetolalet.epizy.com/benedetti_poemas_de_otros.pdf
    • http://dijimati.rf.gd/94349049137.pdf
    • http://bevamixebigal.epizy.com/anticonformisme_traduire_en_anglais.pdf
    • https://uploads.strikinglycdn.com/files/bc58b4ab-37fb-4bc2-9563-9f246df75800/nupozulumikipinogefaz.pdf
    • https://uploads.strikinglycdn.com/files/0deddc21-8e8a-4357-a6ad-a74611a025c1/piwibipudasafuvuzet.pdf
    • http://vefilemegukur.epizy.com/grb_organic_chemistry_for_neet.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_off000103cd.bin
974f099b2ec623c1aee507f71ce64c8b8cc2c6b1d39f8e0256f1572913147832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 5328 bytes
font_01_sfnt_off000115f7.bin
279e73ba14ca0bffc7b939766e7bbed968b550816e57060bfd101b35f6782dbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 11548 bytes

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