Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e273f65b0c1bbc2…

MALICIOUS

PDF

79.0 KB Created: 2021-09-15 16:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 442233b0c99eecc5a51d8179fd4c6ee8 SHA-1: 36272ead625744d6fb985deaf179e4e757d0b615 SHA-256: 4e273f65b0c1bbc23363a0aeffd5957b2e0605c6a8fe90d70d548b8d23826069
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to external domains, many of which are likely disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=dragon+ball+z+kakarot+piccolo+vs+android+20
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/4284534957.pdf
    • http://vncdata.net/app/webroot/uploads/files/lemidipalejokilinotan.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8c1af3b59---xanexix.pdf
    • https://csn-alliance.com/data/files/11667225489.pdf
    • http://www.ruben.pl/ckfinder/userfiles/files/22837065054.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/xifemugetewegopuwoxigiku.pdf
    • http://archiw.gbpopatowiec.pl/img/upload/files/73705288024.pdf
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/piwilevobitevafejox.pdf
    • http://linklandhotels.com/upfile/editor/files/35743912884.pdf
    • http://studiotecnicopinto.it/userfiles/files/jamasarururipanigulu.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161406d896f035---96088331018.pdf
    • http://idominjazz.com/fckeditor/userfiles/image/48034557176.pdf
    • http://molenat-energies.fr/molenat.com/images/editor/file/lalunodenuzuteru.pdf
    • https://debcopharma.com/userfiles/file/52658680393.pdf
    • https://bimore.vn/webroot/img/files/zofamiredad.pdf
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/timiliwujanikoger.pdf
    • https://jooli.ru/ckfinder/userfiles/files/baligapagumokax.pdf
    • http://habitat3.eu/userfiles/files/pebiragutaxogurarowugepa.pdf
    • https://rakowka.pl/userfiles/file/vosefuwivirop.pdf
    • http://hanilkwanla.com/uploads/files/pupuviwek.pdf
    • http://salukool.ee/upload/userfiles/file/sabejularujexitepipajafot.pdf
    • http://koppeika.ru/userfiles/file/bejisosatavo.pdf
    • https://efsanepin.com/calisma2/files/uploads/83803739548.pdf
    • https://cncunse.com/d/files/wasanusale.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/af8c107b8c24b19900821d76d60ae028/39219495558.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_off0000caef.bin
57aa8743b67fc4fa5f871c9095a6dbd197ccf94d9c6a34584f21d1a3924bd863		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEF 18608 bytes
font_01_sfnt_off0000fbc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 16792 bytes
font_02_sfnt_off000113e0.bin
32b9a1b7086c153aa9fa89ff8731e53fbcbe257e5178303518f9d9ef10846fd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 11156 bytes

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