Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93273dc44f1f6d7…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 16:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aef6ee8a764a07677a47de366423cbb1 SHA-1: 3d87b79c31ff6369e382eba9993913219ca1244b SHA-256: c93273dc44f1f6d7661826141973444dc94a1a1991ed1ff9a32238ee29e9a54a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates this behavior. No scripts were extracted, but the presence of numerous malicious URLs suggests the document's primary purpose is to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=android+ps+emulator
    • https://mcdelandes.ca/uploads/file/lunosowuzoz.pdf
    • http://mayjack.com/upload/files/kozigupebuja.pdf
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/metikoronan.pdf
    • http://registermycompany.in/admin/userfiles/file/11753673141.pdf
    • https://thietbidiensino.vn/media/ftp/file/wurisamimazuvarewujolad.pdf
    • https://noriupapildu.lt/ckfinder/userfiles/files/reguf.pdf
    • http://security-m.jp/tool/images/file/zajisipofaxafetaru.pdf
    • http://vibestedu.com/_UploadFile/Images/file/kezofujepuxopa.pdf
    • http://hortherbpublisher.com/files/upfiles/file/50615885862.pdf
    • https://brakos.it/file/vupijilopaxipo.pdf
    • http://lemonsport.hu/upload/file/28888418972.pdf
    • http://unicaconsultoriarh.com/images/files/1481243936.pdf
    • http://vnos.vn/app/webroot/uploads/files/89079979440.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/d3f335ee4786185a2defc6318138eee0/14386782628.pdf
    • https://bcm.es/files/galeria/files/wowebugowevogamosudipime.pdf
    • https://bandotrading.com/uploads/file/nukezokumopopixowil.pdf
    • http://golfvillageonline.com/userfiles/file/fonugesidexisefezomek.pdf
    • http://dui-antidote.com/images/userfiles/file/71808923188.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/29373419507.pdf
    • http://mayinmaunhat.com/upload/files/15525032371.pdf
    • http://makesomenoise.hu/upload/file/morudinesasu.pdf
    • http://kgmda.com/upload/files/18271540648.pdf
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/giwitadajururudix.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_off0000ae03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE03 16792 bytes
font_01_sfnt_off0000c615.bin
945064e1aff7b1393a002dec5a4b7c314ab9606b7be3e9c0a3eda469128c803e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 15156 bytes
font_02_sfnt_off0000ec63.bin
9a6df307930cdd7b639eb7909a2b769bf3936c7016de70b754fb82c21ad67b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 10636 bytes

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