Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1024b0746097e2…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 06:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5076835544a8c7ee04cdf8f6373490b3 SHA-1: 28a19961c80a3bc123e87010f8b80135b7aa63fe SHA-256: bd1024b0746097e2fb4ef970ec44dc83c36b1ef584a4cc5c13325d8c89194f55
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file as a potentially deceptive attachment aligns with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crewmak.ru/uplcv?utm_term=the+letter+from+birmingham+jail+pdf
    • https://concurs-euclid.ro/upload/fck/99334106580.pdf
    • http://rileyillustration.com/images/agency/files/58445483478.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/36053513765.pdf
    • http://vetportonaccio.it/userfiles/files/77467753377.pdf
    • https://silverbirdmarketing.com/pages/images/file/napuborapa.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/75010609890.pdf
    • https://www.winsum.frl/ckfinder/userfiles/files/kefemekowum.pdf
    • https://brakos.it/file/27142617167.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f015785fe4---24562058217.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/31045189351.pdf
    • http://inciboya.com/resimler/site/files/diposixowatenive.pdf
    • https://zohopinler.com/calisma2/files/uploads/84483873928.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/98076946943.pdf
    • http://turinhotelcompany.com/userfiles/files/35116856670.pdf
    • http://palyavalaszto.hu/teszt/upload/file/mefufirerujule.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/ribikupabajemosirikeze.pdf
    • http://sevinctekstil.com/resimler/files/76424951658.pdf
    • http://ultraljud.nu/bild/files/gezis.pdf
    • http://lukinserv.hu/file/xedugaxutijebetubat.pdf
    • http://macro-e.com/app/webroot/userfiles/files/54752606730.pdf
    • http://botosani.ro/img/uploads/file/46779987242.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/79773641642.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_off0000bc9c.bin
6fb5b562dedcd76302e4cfff494840ca6271625c81f840a06b3e9d3a0ab5ee97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9C 11008 bytes
font_01_sfnt_off0000d582.bin
0a08fd29319177f803bebd5b44a75ccfdaa2b5c18e4f373128bed0c7f52d1556		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 16104 bytes
font_02_sfnt_off0000fe8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 16792 bytes

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