Malicious PDF — malware analysis report

Static analysis result for SHA-256 8203292e1f6f92df…

MALICIOUS

PDF

66.0 KB Created: 2021-09-13 12:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f62ab7a7cff2ded2b964e866226af4d SHA-1: 3b8dd4edd6474eff20a9233d859f0e7c04dc1b4d SHA-256: 8203292e1f6f92dff106f7d6eb0e8973c60b5d84d97158b085827ee0c55b664c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, commonly seen in phishing or malware distribution campaigns. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF format itself often leverage JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=d%26d+3.5+monster+manual+pdf PDF link annotation
    • http://adec-interiors.net/Uploads/file/balulizi.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/87963558995.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2ab922d5b76dd7f38a65aa65125a08d/kefonemodi.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/livilojamujigi.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/fekoxitavebutajujomok.pdfIn PDF document text
    • https://edarky.net/data/file/5836269894.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/zikuxifazu.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaxonisazegalegujoritidex.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/6373714804.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/58232746577.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/velapadokizomujirenulub.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/medotikelixufis.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/nemiporabonuw.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/63528290866.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/96189428467.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/49361481410.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/97e0f1b257fcd302fafbb069c5a007f2/loserubugixojojuwerizo.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/keverek.pdfIn PDF document text
    • http://infosierra.es/images/editor/nutepesumafudodadavemebem.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210906_92814E6AA2F35366.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/44204464763.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/64811638985.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_off0000ad56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD56 14232 bytes
SHA-256: d6602c581da66f010718e454b349ebba782bca384ec0be69a9974d045e856626
font_01_sfnt_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8

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