Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc06aae1f459b4ee…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 23:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8bedc76d3252047cd5dfea3eb7a6e35 SHA-1: eb0c3960b57e4b586b1c41e4b3cf7fa8ff34cf9a SHA-256: fc06aae1f459b4eea214310f213d1a155dd9ae69706dfcd5018cbad47f8aa167
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM confirms this behavior, suggesting the document's primary purpose is to host these links.

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://nomylo.ru/uplcv?utm_term=lustige+bilder+download+android
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2811e8074---jutemululon.pdf
    • http://intelekt.biz/uploads/pages/files/52810862004.pdf
    • https://playerpress.com/ckfinder/userfiles/files/kigifefusobirosete.pdf
    • https://quatden.vn/webroot/img/files/guwejuku.pdf
    • https://rireenfrance.com/images/upload/files/98615905866.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06399f50b---rufijitarunasukuterebaja.pdf
    • http://kesherisrael.com/uploadEditor/files/pabatepibukavinilofesopaf.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/gijowutijoraluzim.pdf
    • http://sowa-architekci.pl/userfiles/files/jafag.pdf
    • http://libertyquad72.fr/userfiles/file/zekufeluxagolasowurufem.pdf
    • http://studiopol.it/userfiles/files/15284060015.pdf
    • https://tourgardan.com/basefile/tourgardancom/files/33664819066.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/petopupolazuputobin.pdf
    • http://dpsnowodworze.pl/userfiles/file/lemafedijodasojapumujom.pdf
    • http://tandprotheses.com/ckfinder/userfiles/files/36466987447.pdf
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/govevuvezodobojulalagegek.pdf
    • http://liccuza.ro/stiri_files/file/bikagezedar.pdf
    • http://etkenkalip.com/files/91797680970.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/31973480949.pdf
    • https://iimranchi.ac.in/ckfinder/uploads/userfiles/files/92108268868.pdf
    • http://amunt.madteam.net/ckfinder/userfiles/files/liwumokiledirakone.pdf
    • https://cebrium.ssnn.ro/images/3108767721.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ace0.bin
1d67b94acd02840b315c04095877f7f0af349ed472d8e00a534d70a58d2cc227		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACE0 15372 bytes
font_01_sfnt_off0000d3f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 16792 bytes
font_02_sfnt_off0000ec0c.bin
db5a8ca5455e51184591b33ffd45a5e228af0ced3ead20a914a4bb1750660db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 10704 bytes

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