Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75cd988059eeb30…

MALICIOUS

PDF

79.4 KB Created: 2021-03-22 21:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fecc4051f34d177d5a82d7db237494b0 SHA-1: 92b9a59d27000c19e5fd635b990b1149ff73425e SHA-256: c75cd988059eeb30ab1ad178b3141ade42f97496b9b5ef3be49bde79d9871f90
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Ielts academic reading practice test pdf 2019', suggesting a lure to attract users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://gimoguvi.ru/123?utm_term=ielts+academic+reading+practice+test+pdf+2019 PDF link annotation
    • https://cdn.sqhk.co/rogevuzazi/FLGYNhg/55812819768.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/g6hahaI/how_to_win_carnival_ball_toss.pdfIn PDF document text
    • https://cdn.sqhk.co/muwanije/goi6Xgi/juvojumuwi.pdfIn PDF document text
    • http://com-signto2.xyz/294004716307wktu.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/fadufifinusige.pdfIn PDF document text
    • http://vegunax.getenjoyment.net/oxidation_and_reduction_reactions_in_organic_chemistry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379854/normal_604cfb732d688.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/hfUOkOQ/zoterapawineboda.pdfIn PDF document text
    • http://kieverts.xyz/jifagaruvu2mroe.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/jaxufotodufatokolexufupo.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/gjfSCaQ/tabedubapovedojal.pdfIn PDF document text
    • http://hugertely.xyz/mezojutevejuropabiguvs9lq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370288/normal_5fe542cc0a630.pdfIn PDF document text
    • http://revershjtb.site/what_is_the_most_rare_namesw1at7.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/vjjjekC/wafebujizuxizanevabiv.pdfIn PDF document text
    • https://cdn.sqhk.co/felegabiw/8bYjaja/fortnite_battle_royale_discord_bot.pdfIn PDF document text
    • http://ottics.ru/ingredients_dunkin_donuts_boston_kreme25www.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_5fdc304d76ef3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366630/normal_5fc867c354f09.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/gpfRPVh/lupavatijulowa.pdfIn PDF document text
    • http://whalesqpa.fun/wubuwikigakurvsuwp.pdfIn PDF document text
    • http://bluebadge-support.com/google_excel_online_loginqwmko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_5fd85138b7113.pdfIn PDF document text
    • https://cdn.sqhk.co/finizaga/7fFijhz/light_up_christmas_wreath_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/jjDhcgg/1675261817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejufutaz.onlinewebshop.net/44989420680.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_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 5896 bytes
SHA-256: 7e745d4b5a4921ec5c3666406a7772635c012db86656381206ccbbcbdf1b04c2
font_01_sfnt_off00010ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA5 10636 bytes
SHA-256: c4efa28ed5df3f537ac669c69f615fe39a568523862b32389d2ff38c363af44e

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