Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c45980f21d1874…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 00:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aef53589135b9492a09c01ac964cba17 SHA-1: 82c1385d22931cb3435fd33f3fd2b28a953f4618 SHA-256: e7c45980f21d1874accbdbd2830c59e87a5358ca854e1849e340e14ce4d5d4e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pataniforum.com/admin/jquery/ckfinder/userfiles/files/50843140183.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161419903799d7---86996086070.pdf
    • http://hanabi-la.com/uploads/files/29871275066.pdf
    • http://ylgems.com/file_media/file_image/file/95464510160.pdf
    • http://summitremodelinginc.com/userfiles/files/famulez.pdf
    • http://copy2d.com/ftp/image/file/wudubunoxiduzamidipuga.pdf
    • http://fasson.vip/images/editor/files/13025519708.pdf
    • https://podimercrm.com/img/files/16282209236.pdf
    • http://adamlegal.com/userfiles/file/palerorubutipozowozizoxu.pdf
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/65117266752.pdf
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/46549189516.pdf
    • https://svltv.in/userfiles/files/13952138211.pdf
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/13676060427.pdf
    • http://fatename.com/uploads/files/202109100902259627.pdf
    • https://total-sport.pl/img/upload/files/89611956668.pdf
    • http://cbestdesign.com/ckfinder/images_store/files/67964372761.pdf
    • http://ubest.ru/images/file/zakomidemokavosuzidadobe.pdf
    • https://sydneystudytour.com/accounting/userfiles/file/lusotuzolulolotebuxenuzok.pdf
    • http://gasasosong.com/upload/fckeditor/file/69241672837.pdf
    • http://schubert-hh.de/image/file/30845124566.pdf
    • https://fotojursa.cz/userfiles/file/18541209588.pdf
    • https://grafconsulting.pl/Upload/file/30822029920.pdf
    • http://www.bash.cl/media/file/26625405626.pdf
    • http://insfilings.com/skyzone_classic/upload/files/60486660326.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cs+go+shoots
    • 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_off0000db18.bin
5c22c00f2cd1adfd90a90da05b0267cd06ddfc95492c6dd840a16a203ca5cdce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 18160 bytes
font_01_sfnt_off00010a24.bin
a336ae08a2429f07dc7ff55efc6a54548071c36dcde65bd09897dcf364fba28f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 9784 bytes
font_02_sfnt_off00011fb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 16792 bytes

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