Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c05ac22eeeff6a1…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 22:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87b4cb02eaa30dffc6d8fc623b998f70 SHA-1: 1f42ee798c134ce33bd0490aca2ba99a75bb912a SHA-256: 6c05ac22eeeff6a19482227ffdb4b798ea1368b1e618399cbcc114c649c581fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with a critical detection score. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document is designed to redirect users to potentially harmful content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=android+games+for+real+gamers PDF link annotation
    • http://archgeo-leszno.pl/uploads/userfiles/files/25828611547.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/devezuxifelidemet.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/13555981689.pdfIn PDF document text
    • http://lg-palette.com/upload/files/20006708666.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/58smkvmvst90mqrlfr1ffbesrl/zazulowe.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/topigenafakekorofumivinuz.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/40999070393.pdfIn PDF document text
    • http://poliinc.com/upload/files/nufiwujetoz.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/10546219456.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/7473578386.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/jufidekubanivupojipim.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/59187794099.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/kurire.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/13605525728.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/29104969757.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/voraxulezobubipikuvuvave.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109172128118191.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/6724720110.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/29938772429.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ed9373f---10425376509.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/sototofova.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/xiwaminomijimopisujajotim.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/jakuwevererevubejizi.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/63792039893.pdfIn PDF document text
    • https://landi-bg.com/images/file/zerujelelozoxedese.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_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 16664 bytes
SHA-256: 75deb8c9d85d7a502fe2b5a2bda4deefb008286e326e028ab5fa20535d5a1f16
font_01_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 10580 bytes
SHA-256: e1e82148d05c15c97d5d84cce0604cfb35bd6f69d899178879f12e54c0227668