Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c6c6e0aa2b8ab6…

MALICIOUS

PDF

73.0 KB Created: 2021-09-13 20:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d1b409557c4a44538132801da5e4a35 SHA-1: 46a1a9681fd27a1dc7ac223b56eceb1dac102eee SHA-256: 06c6c6e0aa2b8ab6a93270099b66ae83337564a5f451e0010ec146dc11267d8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of numerous external URIs and a link farm structure suggests an attempt to redirect users to malicious content, potentially disguised as a game download. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://drironcat.com/images/file/tapakakezupinelinefuxu.pdf In PDF document text
    • https://a-guskov.ru/uploads/files/zixelukubajadekumepi.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/67191606078.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/49131302047.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210913_193142.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/28423881362.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/75695393183.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/kisokusogivip.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/90575413593.pdfIn PDF document text
    • https://tarsiman.ee/files/file/xenig.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/fidobogabupovepozur.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/23028798164.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613832ed6baa3---widizekojitede.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/65624734929.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/mexugewaregovawupe.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/97276974755.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/laxadewidiligotuv.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/8555077584.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/69768109842.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f473216394508055667f8a7945ecb93b/92146116740.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/kigira.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/90922436806.pdfIn PDF document text
    • http://rilta.net/userfiles/files/53604495669.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/karikevamaduzula.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/48663798600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+wolfenstein+return+to+castle+for+androidPDF 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_off0000b9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD206 16032 bytes
SHA-256: 9790d9fba4aff89e7f8a61fcce482726d8c72997e2ef18cd38b97195c024abb8
font_02_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 10656 bytes
SHA-256: 1df4b20d9378981a56df5a08f3516d1847b46096518200610928680aff235bab