Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cef7d42ff502eb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 17:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af5f4a0894da24c58b6c0afa528a4864 SHA-1: 22ae79fa7a9a029adbd92f20ba3174b6977b49af SHA-256: a0cef7d42ff502ebf3d9c2192f60e127da31498e34c32f8cd76ef1d19f76c0fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+get+free+gems+on+clash+royale PDF link annotation
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4cf4fa42---69932716923.pdfIn PDF document text
    • https://beaszemin.com/files/57456822419.pdfIn PDF document text
    • http://freestyler.cz/img/file/nivolirore.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/marafivikoniput.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144ababbf27d---bidebuxomelukobesez.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/56106841380.pdfIn PDF document text
    • http://skupka54.ru/upload/m/weduxugokatexowizafot.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/nomabatasunafaviwas.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/wimikepeloxusedapu.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/duweselujos.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/vulutefo.pdfIn PDF document text
    • http://mebco.ru/images/file/rasokitav.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/sedivotuwuluvivukadedon.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/15723530154.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/71350252799.pdfIn PDF document text
    • http://huiking.cn/uploads/file/160411412439.pdfIn PDF document text
    • http://compsult.net/userfiles/file/xelowexumuvamivaga.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/tafewupiv.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/57250023186.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/57504064100.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/49492479873.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_off0000ca49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 10884 bytes
SHA-256: 89c3558c8ab1df06649388436f40cfbb1efd45286b1061505603d72c44960568
font_02_sfnt_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 17092 bytes
SHA-256: b6e93c512308d8738902eea5ae0dcef6aa5afc7d2a21a3807fbd0d74c8669991

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