Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b3d158a0f0018b…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 22:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7b7aa8d258201aaab5265dfe4ebf0ed SHA-1: 01d50473b55c41d2597f610939549b30ebba700e SHA-256: e9b3d158a0f0018b104fb634b3653e0914a3725e16ecc67ba0af33ecbeff515b
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. The presence of numerous distinct external URIs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggests a malicious intent to redirect users. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zap-interactive.com/uploads/files/68277999856.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141141e6d339---dovixat.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/lulexowazuluxivuropaxogoz.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/mutufosujowubepesexim.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xanasosipumozifilukogite.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/bokijujerobira.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/vigikedufuvejibeguma.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/63946326417.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/sexijaminanuforo.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/tizebokat.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/75423251545.pdfIn PDF document text
    • https://thepainter.asia/upload/files/94717200064.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/50636439952.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1751847246612ef34756590.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/46694386229.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6e44dbaf8ca7e7bb0f262ff12f3bf807/jatebe.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/6034099094.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/togimelazixuvosoduvijuwem.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/sisuzapesasidik.pdfIn PDF document text
    • http://retailcop.ca/files/90285823718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+gmod+for+free+on+pcPDF 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_off0000b61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2F 15532 bytes
SHA-256: a8b2fd57c64a6987100818f4970bbce3ac2808598f038b7faa2d8ddad86a6a0f
font_02_sfnt_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 10572 bytes
SHA-256: e3dcb22d8ae9ebf309484bf27cdb1f3241cefcc1a791beb8a45bf50b2eb9e418

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