Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a5146757fefa057…

MALICIOUS

PDF

69.5 KB Created: 2021-09-20 01:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ccdc1e743fd19d422514a64385000ae SHA-1: 23c6cd6295a0e4ddb887f1d067b7041992f6cb26 SHA-256: 0a5146757fefa057725c7b35dd0551e35530e9f052a0d1af9d66c2ba7f1c9692
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The file's structure and the presence of many distinct hosts in its links align with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/sodomadakavefudozosufuk.pdf In PDF document text
    • http://argyleliquidations.com/userfiles/files/likiziraxifonizelufagad.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/84574225177.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/xilamonazevawokekufetud.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/00a433dfcff547453831ff756675e797/bozonamupobarazapumet.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/80392633400.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/82413903446.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/64411585908.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/zexetazilukelifi.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/32948088290.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/wizewi.pdfIn PDF document text
    • http://mlead.net/images/e/file/98057450196.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/zinexopolinu.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/nogewunatiripewa.pdfIn PDF document text
    • http://peintures-descours.fr/fichier/files/zulikifidewuw.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613937d647aef---18496056486.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/lobogowukelebekedope.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/felobavonuvamavep.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3664292354.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/togojitezujuwasan.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/13451893058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=responsive+html+email+frameworkPDF link annotation
    • 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_off0000af54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC766 15876 bytes
SHA-256: 37811af2168879cc6f47a217db264b11adf35ed890e007faef19232a78140eeb
font_02_sfnt_off0000efcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 10912 bytes
SHA-256: b5d817369148db7a295761df82cab70bf7dfae1bc5173cb9c3d101aa9f8c842e

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