Malicious PDF — malware analysis report

Static analysis result for SHA-256 616836a5e7934b27…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 20:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a4d0b211ee630b8d01dfbdbf25c802f SHA-1: 6e95b962d05d050c2480b5193b7b6a8263292a19 SHA-256: 616836a5e7934b27ec1867b08a04f8282aa7fb8808673ac21ab7acb3621b4a95
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for executing malicious code within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/faruraxuzetena.pdf
    • http://pascalparrot.com/uploads/assets/file/xomajorizefejitu.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/74235508019.pdf
    • https://stl-log.com/htdocs/cljr/data/files/72930543107.pdf
    • https://bi-kiesabbau.de/cmsimple/images/file/biwunakofosi.pdf
    • http://chinhlytailieuluutru.com/media/ftp/file/96298269201.pdf
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/69537335268.pdf
    • http://gesundimjob.at/images/content/files/16920834261.pdf
    • http://vigova.vn/Images_upload/files/98771408485.pdf
    • http://sin-hua.org/userfiles/24933551966.pdf
    • https://lawrenceyezersky.com/userfiles/file/85846851267.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16146dc3fdac33---83395519145.pdf
    • http://tokyoto.pl/UserFiles/file/79568155845.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/0fc2f1a970d4a644cf191c45b0bed813/miratijowelosubuj.pdf
    • http://svenskafik.se/uploads/fckeditor/file/61100969383.pdf
    • http://oskarmak.com/userfiles/file/83974732196.pdf
    • http://creationart.hu/files/file/13880265957.pdf
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/kumiboforened.pdf
    • http://kuppersbusch.hu/userfiles/files/tepifotitegakan.pdf
    • http://furniture83.com/upload/files/fuseg.pdf
    • http://uchid.com/uploads/file/5776675665.pdf
    • http://panteres.com/files/files/99400259262.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/95231099982.pdf
    • https://purmoradiatoriai.lt/images/files/72960622023.pdf
    • http://gestioniarmatoriali.it/25815573986.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=western+channels+on+firestick
    • 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_off0000d76b.bin
7ef86f8e4ca71cfa6ba3394625f1dca768a798f1ec12ad57939f0a8405cb154a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 10520 bytes
font_01_sfnt_off0000ef55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 16792 bytes
font_02_sfnt_off00010767.bin
2212c31ce1c41cb7c33d6eed916fd9f2d84ff9c90698fd3d015796dc322711c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 18372 bytes

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