Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a507f93a967567…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 13:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ba3e9f105c49e6f500d7c4cc3bff3a4 SHA-1: fdf87d501e06b4c96a16f232156ca20231d67254 SHA-256: 81a507f93a9675675d5571dd3c45a725fd2eff0e1eecaa3707e5c9dd2aadc24a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were extracted, the presence of many unknown URLs points towards a potential redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bsa-billiard.by/images_from_html_editor/file/8706293592.pdf
    • https://holocaustresearch.pl/nowy/photo/file/logol.pdf
    • http://shortguycentral.com/ck_uploads/files/57907853061.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/21920870649.pdf
    • https://istanajpdua.com/contents/files/gudegixelot.pdf
    • https://habibitoursegypt.com/ckfinder/userfiles/files/jozoka.pdf
    • http://tcgardening.com/userfiles/file/2021091022290673499.pdf
    • https://iamtimeshare.com/userfiles/file/riranidam.pdf
    • http://viethanit.vn/hinhanh/file/woferituxumi.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/jowagebaduxigujo.pdf
    • https://angkaindaman.com/contents/files/62858582879.pdf
    • http://didaconcept.com/admin/fckeditor/file/94231251229.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d834b611a1fe7f3429828ead7bd639ce/wizuzupuse.pdf
    • http://52963566.com/upload/file/202109171655151347.pdf
    • https://resulgame.com/calisma2/files/uploads/gedalimazomufafokudo.pdf
    • https://garmin10.ddbseven.cl/userfiles/file/sezirokirigubopis.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/pujaneratuzarosazab.pdf
    • https://mauspro.net/upload/files/43269843702.pdf
    • http://stoka-saarlouis.de/userfiles/file/fanobamanifubu.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/gjf0ade6npeg3aao2jl6ul32j6/kobadozugaw.pdf
    • http://ahkjt.com/upfile/file/kufebagupo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=no+messenger+chat+heads
    • 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_off0000adc2.bin
59ab2e87662f2e4fef8b01bd32048e4ba01223e6e4f48f0f687a7278480dbb05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADC2 16784 bytes
font_01_sfnt_off0000d8ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 16792 bytes
font_02_sfnt_off0000f0e1.bin
a8fa9fa887def70a772bcfbf9fd31bfa59b96c0631acfa00412c4397fcab7c0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 10656 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.