Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c29055f595b534…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 18:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4a615a0e7a6130d4f36cfe9cfcc1cbc SHA-1: 98c4e8f854b36bb288c495cee6eb2eff4a93340e SHA-256: f6c29055f595b534c1d69f0d70840cbfa4b6aa3055831566874aa9563135453d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=free+pokemon+app PDF link annotation
    • https://nieruchomoscikomercyjne.co/files/file/vegabexivusedotaw.pdfIn PDF document text
    • http://mousike.it/img_ins/files/luwizusemew.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/72215383951.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/11880629260.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/tikujibimugom.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135ffbc5c41f---95510208661.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614136fdf3f4d---fatumakironupefe.pdfIn PDF document text
    • http://rld-carbon.ru/file/88704690041.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/39203523747.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/gulatexijupegizigedome.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/loraxowim.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/72738226292.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/66441688023.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/72726163149.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/46061780752.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/tuzosaguxupuva.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/sidevomoritow.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109070244464566.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/migaduj.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/kidinelajiladuxep.pdfIn PDF document text
    • http://hybsch.it/upload/file/nosepa.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/80081115888.pdfIn PDF document text
    • https://yodobashi-church.com/nuzugutijalonu.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_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 17336 bytes
SHA-256: d3e52277c0a3303cd6042515af8bef650be7e510e7f11392c8b18040ece7a4f8
font_01_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 10076 bytes
SHA-256: f3fcdfbbd729caacd8ffb2e884a3424a45b4c31801010893794dafed4adcc047

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