Malicious PDF — malware analysis report

Static analysis result for SHA-256 660940d1ef2eb0da…

MALICIOUS

PDF

80.1 KB Created: 2021-03-17 08:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c5bd9eb7e88746ec39081a504aeeafbe SHA-1: 93218413d488ac6958a7a5298f84088f99956764 SHA-256: 660940d1ef2eb0daba7044aea2b1c37709b955d12d131b36b11cc59f0702ade0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to a game review, directing users to external sites. The presence of multiple external URIs and the link farm heuristic strongly suggest this PDF is designed to redirect users to malicious content.

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://botokaw.ru/strik?utm_term=dungeons+of+dredmor+review PDF link annotation
    • http://kiwenalod.medianewsonline.com/52050361984.pdfIn PDF document text
    • https://zediruli.weebly.com/uploads/1/3/4/7/134725524/658ef9a5df81bc.pdfIn PDF document text
    • http://jawuzoruba.iblogger.org/nuxobazijujukonajapi.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/the_daughter_of_time_josephine_tey_audiobook.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/afterglow_wireless_ps3_controller_problems.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/programmable_logic_controllers_5th_edition_petruzella_solutions_manual.pdfIn PDF document text
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/wasunejokajug.pdfIn PDF document text
    • http://bagezokazuraw.medianewsonline.com/garmin_740s_replacement_parts.pdfIn PDF document text
    • http://pugorot.mygamesonline.org/fidorane.pdfIn PDF document text
    • http://xezobofelupazat.22web.org/23711124468.pdfIn PDF document text
    • http://tigibisolefora.mygamesonline.org/riello_burner_wont_turn_on.pdfIn PDF document text
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/1122349.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/que_es_semntica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/why_is_subnetting_so_hard.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/zowesinuporemoxomibaf.pdfIn PDF document text
    • http://kenuzuwemonuda.epizy.com/what_to_do_with_patchouli_leaves.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/astable_multivibrator_practical.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/18557040795.pdfIn PDF document text
    • http://nekixejulodel.epizy.com/94184652993.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/94444720102.pdfIn PDF document text
    • http://gubawakelu.onlinewebshop.net/speaking_activity_for_intermediate_level.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_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 5136 bytes
SHA-256: d4fccb28016637a410aecb9432a4eb40bfc99fb38db2e2fcc4ae224c3adaa317
font_01_sfnt_off00010bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 11284 bytes
SHA-256: 914dc4655b92bda221963eca6405a5bb17d2d4924a858a98066f430ce1ca2633

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