Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3f2eef5bc5935e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 13:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d9992a170054f776bc337a6205430772 SHA-1: 082606b2a8c7d482895d3a58c6ae6d8c8603f36d SHA-256: da3f2eef5bc5935ea64e05df90b424e1de3b47365353d4eeb9e46a250ff34547
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream 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 trick users into downloading malware or visiting phishing sites. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=nba+game+android+free+download PDF link annotation
    • https://psystat.net/candyticket/uploads/page_images/files/mofib.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pededegesalozojilekevuz.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/18965194479.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/pifetesoj.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/deputagaforep.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/34356627435.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/wulopaxijulutu.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/86395844148.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/17561601276.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/2999163955.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/misuvubagegasu.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/70953923093.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/pofisagogosizoxikanud.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/39207156271.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/3005907805.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/38087410699.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/ruked.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/werikugamuzasogitimo.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/42490002386.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/87481495004.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/89244913844.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/biwapakigikufikemota.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/zejirijavesola.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/zekeruronadak.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/5dg50pcpgn4ilbrrjhmloisn7b/xerozedikunaradi.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_off0000b117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB117 15860 bytes
SHA-256: 7504d051efe4848e8e8654afaa1a8c47daa45e31127ff237cccd73ec8121ca29
font_01_sfnt_off0000d8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 10636 bytes
SHA-256: a50822777edc140fb23052f7a97cb407a1656f86977300354d2bc95037eb43c9