Malicious PDF — malware analysis report

Static analysis result for SHA-256 685ce35fe9179b43…

MALICIOUS

PDF

73.5 KB Created: 2021-09-02 09:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6c61b02a81edb0f5ea1aedb6d723095 SHA-1: 7053b0b79c55de022c881b1dbe99b684971cbc6f SHA-256: 685ce35fe9179b432591c0f3a01f3d9c78bebc35b5fe8622b37cd6644e47ae99
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation and redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bhsbeacon.com/FCKeditor/file/21328863813.pdf
    • http://istanbulballoons.com/ckfinder/userfiles/files/16076725167.pdf
    • http://airfa.it/userfiles/file/rebuna.pdf
    • https://retake.dk/ckfinder/userfiles/files/vudaxukefijuv.pdf
    • http://malopolskiszlakwinny.pl/upload/File/xezipevesof.pdf
    • http://sostrevalli.it/userfiles/files/80844624972.pdf
    • https://marikakozmetika.hu/editor_up/90216031785.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3141702181.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/26920444829.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ei1327rsgpt5pmpgac80gub786/33077979229.pdf
    • https://tepihtrava.rs/files/satit.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd3d231001---jumaluzuxixad.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/89383785576.pdf
    • http://nerezove-kuchyne.cz/UserFiles/File/21893690187.pdf
    • https://brs.jo/userfiles/files/12958165880.pdf
    • http://www.oiseaubleu-promo.fr/userfiles/file/2615303349.pdf
    • http://ruresept.ru/files/file/ximubosaxinam.pdf
    • https://chief-moving.com/editor_upload/file/kotorifalupalagapemuz.pdf
    • http://asiavent.com/UserFiles/file///nufaperarexek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gta+online+most+armored+vehicle
    • 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_off0000bbf6.bin
fe2729de74afdc88012cedda85ba7911beaec0f5787399623eaba43eb5551bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF6 17196 bytes
font_01_sfnt_off0000e82f.bin
b822dc20b9d358056bf17cc8be19c6ef18e479c1fbbe5e871316f12b1d82db24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 10740 bytes
font_02_sfnt_off000100bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 16792 bytes

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