Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee35e4bd46343371…

MALICIOUS

PDF

125.9 KB Created: 2021-09-08 18:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20bd55bf86b0e2e38ebcc69d1ddf8152 SHA-1: 7ac5d773e7084b672a76379e9f00fb0ec294286c SHA-256: ee35e4bd46343371c2b044266689d44c739e5f498c00ec64c6430eeaa508c3fa
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, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://gzwep.com/img/file/202191205919.pdf In PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/72470461253.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/99482079499.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/xewemisofakegazuwupuge.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/xepaserajinaviben.pdfIn PDF document text
    • http://erictex.com/ufiles/files/63864352049.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/papojuvafurujewoma.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/lenidifowedalebozuxi.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/lesoviromibatujidozatul.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/xidinife.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/57704395406.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/71895983901.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/mamezipitov.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/relemelafewepo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b384cf7a5379831fbd8d5ab09a572de0/tizijela.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349419907c8---jewawesorezeboris.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/tezodalipudopetuf.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/jozekurigaxepar.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/sugunazelidukodibog.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/26499685760.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/vexazogufe.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/41729138291.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/ruvikubedewilozon.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/78892071387.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/25218300755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=tactica+y+estrategia+del+examen+mir+pdfPDF link annotation
    • 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_off00018225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18225 11020 bytes
SHA-256: 01b26ea0afd357fa92ebcac668a749788fb8a67ec5f59eaa7380dafa772fda98
font_01_sfnt_off00019b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B9A 20636 bytes
SHA-256: b097d416544e9ab92bc5b1c27755da5d4189c90b378802a17d3f48fc9ea01081
font_02_sfnt_off0001d0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1