Malicious PDF — malware analysis report

Static analysis result for SHA-256 004b1469ececca44…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 09:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 635adc4f74e526d49fd6d334624e8e5a SHA-1: f5d3f69fac53695089bf176598fa4717289d251c SHA-256: 004b1469ececca442872dbef8ebaa9c68aa968d396a78d5ea8ec4656b7b15ff3
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. Heuristics indicate it functions as a link farm, directing users to numerous external domains, many of which are unknown or potentially malicious. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://euredit-editions.com/userfiles/file/46431085942.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/sazuteves.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/dipupolirul.pdf
    • http://cmcthailand.com/ckfinder/userfiles/files/29094941092.pdf
    • http://jewelry-shopping-city.com/uploads/files/202109171938426408.pdf
    • https://bevasilicones.in/userfiles/file/38461442980.pdf
    • https://franchiseharbor.com/files/files/nagova.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/daxudiwev.pdf
    • https://aldurra.ly/images-editeur/img/file/69178686229.pdf
    • http://thsport.dk/userfiles/file/defidajikomawovop.pdf
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/zirewipoxuvavilelus.pdf
    • https://luathoanghuy.com/uploads/files/xitudesaledok.pdf
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/18131995980.pdf
    • https://emailing-online.fr/uploads/userfiles/file/wexokegibuwomulalu.pdf
    • http://artpolinakuzina.ru/pict/file/datafetuferotaxefebejed.pdf
    • http://licausi.it/userfiles/files/12576549185.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3cc3b14d851bd51ebc552c804e7b1341/33746199803.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e3a00a6e8---46227377845.pdf
    • https://weddingitaly.jp/images/file/62425938880.pdf
    • https://tatvan.in/userfiles/file/vezigeme.pdf
    • http://dkmmotor.com/files/userfiles/file/gawetizotogepukepubufawa.pdf
    • http://d2dgroup.net/upload/files/2883743419.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/peluvufuxuved.pdf
    • http://mertcelikkapi.com/userfiles/file/72634889836.pdf
    • http://olapromos.com/ola/uploads/editorImagesfiles/83210125793.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bowmasters+android+1
    • 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_off0000d5f3.bin
d958e5c40e0e49f52620eec758a233c7094de5d1273c2ca49bca8432adf43bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 16708 bytes
font_01_sfnt_off00010146.bin
ead8b9a5cd770b1c9796a8991bf650ae077a80bdfaf1bada486f832d6d1af5a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 10552 bytes
font_02_sfnt_off0001197d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 16792 bytes

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