Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c6eec9eb3d184e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 17:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 093ee30338e18b3646840d699f23913e SHA-1: 033770316f9d532cee2a41ad91786761b13d8927 SHA-256: c8c6eec9eb3d184e1817510827b1bbb8f562c0a658b6cb25b4730ed1f69d364f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links pointing to various domains, suggesting a link farm or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination of the links. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of malicious URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://chanakol.com/ckfinder/userfiles/files/85630386623.pdf In PDF document text
    • http://qdsenfeng.com/data/files/9506371176.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210915_45296F83B0983BAB.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210909004416.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/sidaguwasimasularapuv.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/0b1bfebd3398b0be2abdc61ab0f8d7f7/gutasuligomezilejogofuxi.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/bezuvibuwubibekomof.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/gurizosu.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/berusalogepexulosumixese.pdfIn PDF document text
    • https://successalpha.team/upload/files/sajukulosopanazepub.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/6551862345.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/xexibatazaxu.pdfIn PDF document text
    • http://protok.pro/upload/files/mowexojifuxupiponuzabivar.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4c869a91---49140600131.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/rarisakevimaduvoriken.pdfIn PDF document text
    • https://labelmarket.eu/data/file/wuwimuguvavudukezilixe.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/74151529510.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/vuwobexefebuzali.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/lelafupopimekofizuso.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/gumuk.pdfIn PDF document text
    • http://jump360.co/upload/files/20210901211838.pdfIn PDF document text
    • http://18554080.com/userfiles/file/jojomopusobopom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=can+i+have+a+live+wallpaper+on+androidPDF 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_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 10404 bytes
SHA-256: ee49f72f900f33828b8f04412d515f9f9c487e043d47e3377cd6fa35037f5942
font_01_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 18148 bytes
SHA-256: 914dee86588741d7a890e5d3372072d21e40924990ef0d4410e9069d955e132f

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