Malicious PDF — malware analysis report

Static analysis result for SHA-256 991b5ca2cfdada48…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 00:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a94a184a25f9f5db2418b9fc3bf74e6 SHA-1: f7bdf86764f9d0a372419ec961b7ef977fbbed80 SHA-256: 991b5ca2cfdada486f8c43501c34c23c5b8fe4c01857cf052cc59a8be917c13e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The primary purpose seems to be directing users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=rockstar+music+code+for+roblox
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/39234960026.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161450235e8942---34643655406.pdf
    • http://orvosvalaszto.hu/uploads/files/79463918144.pdf
    • https://easypayindia.in/userfiles/file/70206357396.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca1cdaf0d---66711385585.pdf
    • https://gesema.com/UserFiles/file/93186855834.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/53575218726.pdf
    • http://vuason.vn/upload/files/52908352428.pdf
    • http://aa-nusd.jp/5201709168.pdf
    • http://dulichtantai.com/files/uploaded/files/limogutalulowolisim.pdf
    • http://gainliving.com/upload/editor/file/92598456846.pdf
    • http://mascotdd.com/file_media/file_image/file/duwenuremilekipidom.pdf
    • http://carrasvilla.es/uploads/files/xofirarular.pdf
    • http://benthanhsgfarm.com/images/uploads/files/betomijedejumiwumenoludet.pdf
    • https://synodradomski.pl/userfiles/file/36651085905.pdf
    • http://egitara.com/upfiles/files/63706629061.pdf
    • https://moolans.com/uploads/files/21812688484.pdf
    • https://taperagi.com/contents/files/7700905433.pdf
    • http://dongbanja.com/userData/ebizro_board/file/2554408553.pdf
    • http://labsshop.com/d/files/zepafexerulogedir.pdf
    • https://pasarantogel2.com/contents/files/1162571019.pdf
    • http://lahma.pl/_u/userfiles/file/fuxaloludowituxixukixaraw.pdf
    • 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_off0000e0f5.bin
20b79b066a49c82d67e20ac4f3ba65320725c4d493c093ff06da4acaff398587		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 18380 bytes
font_01_sfnt_off000110ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 16792 bytes
font_02_sfnt_off000128c5.bin
175ff59a105efd349e08ede3a91af128ff4380752bf3f0fd098c92c6ef0eb5eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 11012 bytes

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