Malicious PDF — malware analysis report

Static analysis result for SHA-256 868c52207878b2e4…

MALICIOUS

PDF

86.5 KB Created: 2021-09-10 08:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2260ccc0b9cc42045fe0b962780546f2 SHA-1: 81b6c213dea4ce303f4f90747b14d1e206cf4e68 SHA-256: 868c52207878b2e490e7ccca64f979d2fba66350bfa6069cd36ed9aec2d2886c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the link farm and potential phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://szallas-karpatalja.hu/upload/46523137827.pdf
    • http://gorsilawfirm.com/userfiles/file/10462221966.pdf
    • https://mygrind.ie/userfiles/file/56063543675.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f5rbddjtnfq3q0kr8afu24hd3e/guwena.pdf
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/97491264208.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/fh45uikb4ejdt4c52q09nihul3/28910150239.pdf
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/59554223928.pdf
    • http://skrabl.pl/www/rpbd/fck/file/71721429010.pdf
    • http://cokhilegia.com/upload/files/kavuzejumag.pdf
    • http://cementfeet.com/userfiles/file/27658392013.pdf
    • http://fruhmann-elektrotechnik.at/9051340566.pdf
    • https://intrigantka.ru/images/userfiles/file/36829757266.pdf
    • https://norservis.com/files/files/roxilagirogebitanerasuxa.pdf
    • https://amatnieks.lv/pictures/image/kazeta.pdf
    • http://apartmany.cucoriedka.sk/data/files/zirizezinoxodozumisolirab.pdf
    • http://bdsductri.com/upload/files/xugoj.pdf
    • http://www.kickcommerce.com/userfiles/file/51240876684.pdf
    • http://www.niceresidence.net/image/upload/File/66064780725.pdf
    • http://rubivina.com/Images_upload/files/86184555968.pdf
    • https://ppkh.net/userfiles/file/2447889833.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/tixepabada.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66550096298.pdf
    • http://archgeo-leszno.pl/uploads/userfiles/files/gewuwifovigajaj.pdf
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210907_A4908CF2287523B7.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=which+is+the+best+shooting+game+for+android
    • 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_off0000ee98.bin
ae0029da0e75f4ffa985da68dfd6be473b6720d8ed6af6386c5d8bbbf3a5f860
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 11012 bytes
font_01_sfnt_off000107d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 16792 bytes
font_02_sfnt_off00011feb.bin
7dd48dbc479eb77ee088b6b3e46e5b44de9b5f0eb9e69e590b99effb93a82e4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 17172 bytes