Malicious PDF — malware analysis report

Static analysis result for SHA-256 265e0a886c774441…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 16:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd941fe58316629c9cdfb7cbd12b00d1 SHA-1: 8823d639b045f2a63d3a0b4c89683fe6307fa632 SHA-256: 265e0a886c774441b3db90ffafc5bc29faf0db10cb2a0f5b5862eab0631d3e03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to PDFs on unknown domains. The primary attack pattern involves directing users to these external, potentially malicious, PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://itcbeautytrainingschool.com/userfiles/file/94777804052.pdf
    • https://ijp2.com/contents/files/86641237818.pdf
    • http://erulingua.hu/uploads/content_files/files/14927085427.pdf
    • http://whatdwellswithin.com/file/sodozekurarelifugoxos.pdf
    • http://gzhangqin.com/uploadfile/files/65988027345.pdf
    • https://macroedunet.com/userfiles/file/75768616090.pdf
    • http://www.urbanwaterways.info/files/zegej.pdf
    • http://chapelguild.com/images/usr/45500766342.pdf
    • http://antwerp-reefer-tournament.be/argt/files/folebalebazenogo.pdf
    • https://nichecnk.leaddeehub.com/userfiles/files/5667181181.pdf
    • http://ingpoggi.eu/userfiles/files/2639045326.pdf
    • https://my-natural-style.net/upload/files/73301807714.pdf
    • http://hyunshin.net/userfiles/file/kobivuwa.pdf
    • https://majubesar.com/contents/files/38656674514.pdf
    • http://webinaris.training/ckfinder/userfiles/publics/files/46767592642.pdf
    • https://themalc.org/files/file/rakikagabuwajonam.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/78108931850.pdf
    • http://baharev76.ru/userfiles/file/1181440147.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/kevc7frdb0a9ofoca9sappeuq8/zogowafopoparu.pdf
    • http://e-skala.pl/userfiles/file/kuxuwun.pdf
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/jejosolutorubuv.pdf
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/94349030635.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=yts+latest+proxy
    • 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_off0000d93d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 16792 bytes
font_01_sfnt_off0000f154.bin
a5236ffe3456b13bbe6a99cc440b83e0c6622a577823df557328bd6f85df116a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 10248 bytes
font_02_sfnt_off0001088e.bin
37e52ffea4b46fe8f7eb4ea8b0a66ac50dab920c413944f57da59617d738aa39
pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 17840 bytes