Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c90ed70d686b36b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 16:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d74a87f03f86e1d2ca62d4c71fadacdf SHA-1: da13f3e1cfc26865c415a616f104a248c119e023 SHA-256: 8c90ed70d686b36bdc0fcf493e726f0aec6318a57aa4d5c8dd5dc749f6d05d77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, which is not inherently malicious but can be used to create deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=one+ui+2.1+galaxy+a71 PDF link annotation
    • http://sun-green.be/ckfinder/userfiles/files/89810775167.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369b46bb785---87398510907.pdfIn PDF document text
    • http://bamor.org/userfiles/file/xogewazeranigolekoga.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/gosivolidurowovuf.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/dagiwadisodojuwovetebakaz.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/vumodozopi.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/wevoxesuj.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/15132834239.pdfIn PDF document text
    • http://st03.it/userfiles/files/rugobepapikopesewedezoniz.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/43963484866.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/tulakave.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/vegimow.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/72983082276.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/89107230838.pdfIn PDF document text
    • http://apothepharma.com/upload/files/29072944490.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/93928474655.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/49230723283.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/80343660353.pdfIn PDF document text
    • http://ladna.pl/user_images/file/77041553073.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141912ad9719---zowomeja.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/gonigalodufutederipakoz.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210910_7905A63985AD8D82.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39C 10428 bytes
SHA-256: 6d5b0fe23d886df7ff3d7cffcb0867d3a68388bd3d47f4234f90551cdfcafca1
font_01_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 21744 bytes
SHA-256: aa2c86c49aca8ed5c252f9d18e5d1c769c75a11fb4c40ec4a5317f5f41938b64
font_02_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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