Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d31a6a8696b173…

MALICIOUS

PDF

78.5 KB Created: 2021-09-21 08:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c933b06d628edc35878e031059b4fa4 SHA-1: 1344101f5f10c1489c06b3deac0bc73d585b9d5a SHA-256: f0d31a6a8696b17302a4714a2cbe23801e3e05812125b8770b6f262768d1e317
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=dead+target+zombie+android+1 PDF link annotation
    • http://ueros.fr/admin/ckfinder/userfiles/files/zutopamibatejuvotifufo.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/59696315163.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/26893824676.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/duludunitofebufelexu.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/95914536393.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/58976625404.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/62626618365.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/vemijafivagapimatagi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3291ddc3912f4c337474fd95217d5d57/70198277891.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/bubap.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/zewipatasivojusajuzav.pdfIn PDF document text
    • https://europartner2.pl/uploads/refotodebonidekegitub.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/35811553502.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/favajufikixasesejun.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/97640286605.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210907032040.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/jumeworeguga.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1eb0f38ba766fb5f2a0c109526edef80/welemi.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/86712528466.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/turedekanogelipibofeduge.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/45816930610.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/retabovin.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://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_off0000cefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 10632 bytes
SHA-256: f5966e6c0a31de167e6b73fd6208f778c541cba637972b1ae48f294cdad720ae
font_02_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 17352 bytes
SHA-256: 9e0c54ae660eef444eb570c3a491728de4d2e714d8b3e8e6a4c3bb14459546e5

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