Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19fd829bf860d2e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 14:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a5364085010d096e6e2f6e775d02aaf SHA-1: 402436d742c5fa50abf9cf044660a15ef55e3cd0 SHA-256: b19fd829bf860d2e473946646b5c4fb4ba277e624609a4969206e9456ad8246f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download a second-stage payload from one of the numerous external URLs. The PDF's structure and numerous links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://sandlnae.com/data/editor/file/linogobonuzo.pdf
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/42843423397.pdf
    • http://photou.cc/ckfinder/userfiles/files/manelapowalesisaleluwisa.pdf
    • https://network-italia.com/file/muxagivijugijesuzakex.pdf
    • https://jeanmarcrobion.fr/userfiles/file/99885368661.pdf
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/57653960878.pdf
    • http://medianet2000.net/amm_prod/image_news_popup/file/88404681980.pdf
    • https://damiel.eu/userfiles/file/53978343085.pdf
    • http://kaithompson.com/userfiles/file/77355705520.pdf
    • https://100tmt.com/uploadimage/files/20210912065018.pdf
    • http://gazetavk.ru/img/file/lotix.pdf
    • http://kup-vino.cz/web/ckfinder/userfiles/files/68746031206.pdf
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/murorikija.pdf
    • http://sicilyontable.it/userfiles/files/joxizutovijabokekaz.pdf
    • http://hmsendo.pl/uploads/editor/file/xoziwowuverapisa.pdf
    • http://kbidc.kr/upload/editor/file/1631964707.pdf
    • https://travelworld.ro/userfiles/file/wememuxipaluxafazaf.pdf
    • http://stjconsulting.it/userfiles/files/wukogufenosefofomukixuzan.pdf
    • http://vistobrasil.net/uploads/file/nifuf.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7007b7e2e7be73fe65269be636b323cd/jidurojow.pdf
    • http://hgbs.de/userfiles/file/nefewapo.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/jizikipiwiwegenajobup.pdf
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/vamoga.pdf
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/16479054061.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=golden+english+grammar+book+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_off0000d8a8.bin
01da88c56664b73d6aa0e7fa96c077b501f1b7791aaa176c3f5142525bda1588		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 19056 bytes
font_01_sfnt_off00010a10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 16792 bytes
font_02_sfnt_off00012227.bin
492d96e4450a649c31378de62dd15843ff0f1dfbea27aa791b384560b3488165		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 11116 bytes

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