Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c336f478c750a4…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 07:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d82b95d8c4aa2b9e60d245ccdb5deffa SHA-1: d1e035113b97654541846c636f515775dd16f612 SHA-256: e5c336f478c750a4bcc9be1e265496922e166da65de88bb8e7d1eac3d7720bf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://monographie.com/ckfinder/userfiles/files/resexawi.pdf
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/larak.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/patumugumufeta.pdf
    • http://haenuri.net/ckupload/files/18733800469.pdf
    • http://ykzn8.com/upfiles/editor/files/zezelomi.pdf
    • http://generaldistco.com/images/file/86802044789.pdf
    • http://bannhuaduong.net/upload/files/87411653062.pdf
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/nebamavebero.pdf
    • http://instit.ac/ckfinder/userfiles/files/67322703884.pdf
    • http://deurenhanger.nl/userfiles/file/41805256273.pdf
    • http://inbond-cn.com/userfiles/file/lejemamasiliwef.pdf
    • http://batistar.fr/userfiles/file/17406483588.pdf
    • http://sarkar.ie/userfiles/file/64375218463.pdf
    • http://pacemakerpressintl.com/uploads/assets/file/kuzuretelu.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b47ba87746---2555178376.pdf
    • http://ndt-ultratech.com/files/30506635153.pdf
    • http://yurisolomko.com/userfiles/file/55765220239.pdf
    • http://antwerp-reefer-tournament.be/argt/files/naxuvakan.pdf
    • http://leebyunghun.org/new/upload/board/files/69168815516.pdf
    • https://behbehaniprojects.com/uploads/files/senil.pdf
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kositopodipogolejenog.pdf
    • http://dongtienlamnghiep.com/upload/file/71833261448.pdf
    • http://tcgardening.com/userfiles/file/2021090417010373499.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1ac9bb7a964069285b076b7f4b92ab6c/votigusogepid.pdf
    • http://mixmarketing.vn/upload/fck/file/dedipulutegotukaroja.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cinderella+penguin+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_off0000cd85.bin
92bec2c6a8476804310a9eb5a8293620e135193bd981810f7012873f6ce338fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 18160 bytes
font_01_sfnt_off0000fce9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 16792 bytes
font_02_sfnt_off00011500.bin
db472231672f6ba8830a4141e40ec0024eded7390343b6019d7b2adef821811c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 10420 bytes

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