Malicious PDF — malware analysis report

Static analysis result for SHA-256 f409ec93053d1c7d…

MALICIOUS

PDF

68.8 KB Created: 2021-09-20 18:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ecbde38596350d294d460353d32966a SHA-1: 420d24588490618171bbd2289046063a33f12600 SHA-256: f409ec93053d1c7db172bea12a608028a4bc3733bb1fe4b7358124e7ef00b37d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially harmful content, disguised as downloads for popular games. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://huntic.ru/uplcv?utm_term=gta+5+download+gta+5+for+android PDF link annotation
    • http://hieuchuan.com/upload/files/ferakuwijipotefop.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/juvuwureliloloxev.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fbea5bef0---1407031373.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/35109715747.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/lilivifuxuxaxolivokevisi.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/vixajesepelodameve.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/judunifofovufal.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021092015011138.pdfIn PDF document text
    • http://debten.net/UserFiles/File/saleribanaginefujil.pdfIn PDF document text
    • http://jadeite.ru/images/file/giviwolopakovolaneku.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/86655696607.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ede90ad9a11bf86f2983d319c7f1688f/retitugisolov.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/40879482320.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/64475108666.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/luzuzogo.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/xisawivoxajevi.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/30333474030.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/15331129391.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/54686750947.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/vamiraweza.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/sagipegigexusevan.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_off0000b093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A5 14580 bytes
SHA-256: db3ef50b0180c7205b83a78e4a4e940d56267769ee35572c4058e28296712eae
font_02_sfnt_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 10488 bytes
SHA-256: 9055bdeac00eaaa3bfe23cf8c0f4b08196346ff386b2340528f6dd74b2eda870

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