Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9ef5375c130363…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 20:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e3f3ad1f4c5e5f5a6e925513ca3a2983 SHA-1: c88fcee989734435e307cb9973f9abaf116b1efb SHA-256: 0f9ef5375c130363f2dbd8ff5324c0b83588df07cb2f16493be44a782bfc52af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest that the document is designed to redirect users to potentially harmful websites. The embedded URLs likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=vidmate+old+version+3.04+download PDF link annotation
    • http://matsusushionline.com/uploads/files/13324062175.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/22263242487.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/99613025447.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1943e8f8---kunuvowa.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/sulatavak.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/28354823843.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/rurujok.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/dilegegunuvekitakoruwon.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/13317744418.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/87236819746.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ls26p5rbarj1h8cl4fs0eim206/jaxamemumef.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/tibewudaxivod.pdfIn PDF document text
    • http://araratmebel.ru/img/file/30823408572.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/tinalutifusiwivef.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/49135579536.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/38374888170.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/86849267710.pdfIn PDF document text
    • https://simorgh.it/uploads/file/pajijokovoxijapu.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/92534662829.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/25368124017.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/62343274710.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/zexisajipawumize.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_off0000be66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE66 17536 bytes
SHA-256: 32faf29ed9705b449a9da2adf958bce35ab1b6d07c648dc2195b401fbbd3c969
font_01_sfnt_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 10968 bytes
SHA-256: f1d2de4bf8ae994bcecd4e63056bb5fc7e2e7fa5303071f1df5b7c8d443f568a

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