Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c74fedbcbcb2d60…

MALICIOUS

PDF

75.2 KB Created: 2021-09-29 02:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 881b6afd129e08ef96af40643e52f442 SHA-1: f7fbb8118f0fc3cf79b5335e6ee79929486d0907 SHA-256: 0c74fedbcbcb2d60798db477b4fb8ed6315743a6f6e4aeef008d7e7e0b07b72e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the final malicious destination. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=nulls+brawl+alpha+indir
    • https://accuratesearch.com/userfiles/file/zewenu.pdf
    • http://luyenthidhcanhsat.com/Images_upload/files/42735331518.pdf
    • http://gorisum.net/fckeditor/upload_file/file/67574259755.pdf
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/tetanizepasuleritifawofu.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1sam83pugggadflffo45cd2qlv/22136325870.pdf
    • http://status-go.net/gfx/userfiles/files/32740148603.pdf
    • https://duel.pl/userfiles/file/vilakarenudo.pdf
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/52048667066.pdf
    • http://behtarinekhodetbash.com/files/files/folagisav.pdf
    • http://phukiendoxe.com/media/ftp/file/59964677040.pdf
    • https://myparrotfood.com/user_files/files/filaxaxa.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16140275ebd3fb---14997512194.pdf
    • http://www.serenissimaservizi.com/files/59683575836.pdf
    • https://red-adlay.com/upload/files/86468685326.pdf
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210925_A08E90680DCD7023.pdf
    • http://intelekt.biz/uploads/pages/files/54792662621.pdf
    • https://asztromiskolc.hu/ckfinder/userfiles/files/sapumofevisokalusurimod.pdf
    • http://oletrans.sk/editor_uploads/files/taxuruzivadibafilawaso.pdf
    • http://reklamaopole.pl/userfiles/file/gugugoda.pdf
    • http://martonaroniskola.net/userfiles/file/30768467145.pdf
    • https://ls-machinery.com/uploadpic/files/202109251350002199.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_off0000be5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5C 16792 bytes
font_01_sfnt_off0000d673.bin
19848bf28b30940230d920f147549f9ee69a8f3a1c5474090a08c7a681c38cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD673 10440 bytes
font_02_sfnt_off0000edc8.bin
02c58ddb1acdc9ac430d2c17b0d4b6af9f47f34f3a90624200722d700ed13d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 19124 bytes

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