Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f6488f7af4f6b6…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 20:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 20eff4ca6498b5279f6e9ed03927cd79 SHA-1: 6787ec544b75addcc204dfeb6c0a09b7ceaded93 SHA-256: 66f6488f7af4f6b63f7b0875f3c957ba691c476be31013a6d73dec316f13f0a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which are part of a link farm, suggesting an attempt to direct users to potentially malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sledovani2.gpshlidac.cz/www/userfiles/files/15399166201.pdf In PDF document text
    • http://saluteebenesseresas.it/userfiles/files/naremoxujiwopezadonojigi.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/wasazibijujekadilidoxepog.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/detes.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/91316181613.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613720ab24158---fefab.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/lefaneg.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/taterokov.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/janilavukanofazixukun.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/98107564609.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/95518714447.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/89547977370.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/fuwabe.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://aynadakikemalizm.com/resimler/files/tivoxiki.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-25/20210925152005676953.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/93392278437.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/87945571317.pdfIn PDF document text
    • http://malifer.hu/upload/file/nopalukaba.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/57316746326.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/bedafidobenunudofanuzev.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/luzijufa.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/bewifoneloxetomepa.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/87049084650.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/ruzit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+player+for+low+end+pcPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB252 15284 bytes
SHA-256: 1872af26162aa2208ea55b2e12c468fe0373767e6f66386a4c7aed344b510425
font_01_sfnt_off0000d8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C5 10528 bytes
SHA-256: ad510c88b8b75120d0ddf5e39d1920c92995b4778c86923631d4982c4ad008a6
font_02_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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