Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd639066ec1a51ce…

MALICIOUS

PDF

74.3 KB Created: 2021-09-12 11:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f373666ff1c8aeb0897e664515814c84 SHA-1: 6fee85d0846f9a45c98a8d83597c0667cbbee52d SHA-256: fd639066ec1a51cee4bbabcd13c3c82f2a70ddd25f946dbedceb4d64e885fb67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into navigating to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pactolous.hu/upload/file/kixokowiroz.pdf
    • http://saatgaamkansarasamaj.com/admin/uploads/files/7352858448.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/68642386814.pdf
    • http://gibisch.com/files/files/noworipabuk.pdf
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/36947413224.pdf
    • http://gramercy-grand.ru/files/file/38029293074.pdf
    • http://alnoorcity.com/userfiles/file/941582272.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613544812d625---gujizutikinaropapazawikuk.pdf
    • http://sushimura1.com/uploads/files/ginizomot.pdf
    • https://heuresromantiques.com/upload/files/8804253659.pdf
    • http://dailitara.lt/bites/uploads/file/bojen.pdf
    • http://vivo-mebel.ru/upload/file/fajexoz.pdf
    • http://brava-ekb.ru/userfiles/file/87016808971.pdf
    • http://tc-antey.ru/uploads/files/52472074477.pdf
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/81125090597.pdf
    • https://eminentland.com/admin/userfiles/files/gugejozigiz.pdf
    • http://www.agot.pl/upload/file/vozevugixupefapum.pdf
    • http://tarnava.eu/user_images/file/15621405647.pdf
    • https://xrtradingfeedback.com/cmsimages/file/zumivin.pdf
    • http://qiangka.com/ckfinder/userfiles/files/soketejamorod.pdf
    • https://biharlokmanch.org/userfiles/file/11737872088.pdf
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/jizegavifojosiwoj.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130815222fdf---72694927159.pdf
    • http://dulichtantai.com/files/uploaded/files/17525220138.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=growtopia+free+download
    • 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_off0000c199.bin
18f8f507a5fd95d8640d93f0a51ead0dab51dbe6cda635c25724c9a019d2a85c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC199 16384 bytes
font_01_sfnt_off0000ebb8.bin
e119855c8f1940b0c743df6c3bc75b8669e2cf202c016b8e2016628c6a659c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 10448 bytes
font_02_sfnt_off0001039a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 16792 bytes

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