Malicious PDF — malware analysis report

Static analysis result for SHA-256 397e712a9ee8e26f…

MALICIOUS

PDF

72.3 KB Created: 2021-09-15 22:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d2270b098b149944dd1d0f864908910 SHA-1: 406ac65246b6519b56a8f912200cbeb8a775ef12 SHA-256: 397e712a9ee8e26fe9f37161fa144f7ca054ce1b8bcde675aac37f3a0f4c69d6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to host many links on disposable hosting, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=treasure+island+vocabulary+pdf PDF link annotation
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/10348320300.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/82848977249.pdfIn PDF document text
    • http://videlec.be/ressource/file/39080303785.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/8522980426.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/solabupobosareroka.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767dcbad00---relinexubibunujirufuni.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/puzuxuw.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/buzadutomu.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/70360229921.pdfIn PDF document text
    • https://ancoraeducacion.com/images/dazogel.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/nifasadu.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/lokoves.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/nogurerapulizenas.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/ganen.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/93678645575.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/97061490294.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79338965495.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///levekodolojit.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/23985684306.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b97d353bede8457cbca9b2009cd1cefb/nogokesoruxuseduromara.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/wesozivujofebedirunebijep.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/nepufosedomolela.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_off0000b856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB856 10896 bytes
SHA-256: 47acdd462e76704969c94fbedba8f6726ebf8965ae1737a32a9fb06412f9695d
font_01_sfnt_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 16296 bytes
SHA-256: e2a810a7767d27a5e1c4c15e4613e490b1aa13bfaf2cba9b723716d0bdfb4fcf

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