Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9dc544ccbf8238…

MALICIOUS

PDF

68.6 KB Created: 2021-10-03 06:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc461315e5bce1d8be76c324c162da95 SHA-1: 6fc399d3956157a5cf184269176497c0554fb53c SHA-256: fb9dc544ccbf823890f3ac175092f8c2db31ad879e4678bc0dc08c666490c1c3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. The PDF also functions as a link farm, directing users to numerous external URLs, which is a common tactic for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=not+yet+growth+mindset
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/44059835607.pdf
    • https://fpcofmacon.com/nbloom/fckuploads/file/bitaravajamalijadaba.pdf
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/51323518868.pdf
    • http://sobateracota.ro/mm/file/26966098331.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/64309268105.pdf
    • https://shellserva.nl/docs/Image/file/fuvuzuredu.pdf
    • http://www.aamuhsv-madisonalumni.org/files/files/gajowaxuwulibugazijewan.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161477ac174e89---11341574677.pdf
    • https://deesudcoolingtower.com/userfiles/file/bebevutefefirujiv.pdf
    • https://rmp-familienanzeigen.de/cms/files/98813447343.pdf
    • http://buddhavihara.net/userfiles/file/wotefejufovepo.pdf
    • https://greenlakecruises.com/ckfinder/userfiles/files/40651227231.pdf
    • http://thesciencenetwork.org/uploads/files/90228978380.pdf
    • http://scarpatti.com/files/jogexizilapejigutivupug.pdf
    • https://apelhijau.com/contents/files/46550144195.pdf
    • https://sofanet.ro/ckfinder/userfiles/files/40512652440.pdf
    • http://thaifilmind.com/UserFiles/file/40071657597.pdf
    • http://schokofontaene.de/idata/40638637095.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1615641821e02e---11216301523.pdf
    • http://benevolo.it/userfiles/files/bagin.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/5374909013.pdf
    • http://phukiendoxe.com/media/ftp/file/pibosudizipuf.pdf
    • http://mcutech.net/files/98450274830.pdf
    • http://wasserburg.pl/userfiles/file/57066738382.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_off0000ae3c.bin
52676311eee3207b1e2f31c48e84c4d10ae460b30194591e93bf230b6b91468d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3C 14884 bytes
font_01_sfnt_off0000d362.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 16792 bytes
font_02_sfnt_off0000eb79.bin
b35d3d0aea99ffeefbda940c5c9f51d46a144ff5c0fcd3166644579218e7682f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 10664 bytes

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