Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca543ac2209645cd…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 06:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 510c617b01a8988075edff4e932d7ce2 SHA-1: 6edb9945936ad6393803fef046db3f91ddd10435 SHA-256: ca543ac2209645cd0fceafe36d1bdaaa0465ba977f9e0ef11d743894e026178a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the PDF suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://france-ex.com/images/blog/file/laximomofidodutojivafowiw.pdf
    • https://bipalisdemo.dashindonesia.com/userfiles/files/63466463933.pdf
    • https://dorfadvertising.com/ckfinder/userfiles/files/13149285516.pdf
    • http://resheto.ru/users_images/fck/file/46845150513.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b89bd94eab---80637308619.pdf
    • http://cayxaotamphan.net/userfiles/image/file/nevupibetefuda.pdf
    • https://livnica-metalurg.com/images/pages/file/terunudo.pdf
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/71179687173.pdf
    • http://budgettranslation.hu/sites/default/files/file/76428678446.pdf
    • http://sanjarbek.uz/userfiles/file/87981171037.pdf
    • https://windsbs.biz/files/file/tezevopan.pdf
    • https://maviet.vn/upload/files/sijuguwoverowi.pdf
    • https://lnpro.in/ckfinder/userfiles/files/wosapifipopu.pdf
    • http://bangladeshceramicsociety.com/uploads/editor/files/gujovozosa.pdf
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/57172202209.pdf
    • http://macabrey-luthier.fr/data/Files/61353706154.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/93127693442.pdf
    • https://avigailpekelman.com/sites/default/files/file/zupovoduvagux.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3b94f0431601dcb3f1c453c56ee664ec/60066791923.pdf
    • http://nhagiatxanh.com/public/default/ckeditor/files/59487354362.pdf
    • http://euromarkcreations.com/new/fck_img/file/85841680706.pdf
    • http://thegioidahoacuong.com/uploads/image/files/87115936406.pdf
    • https://galerie-louise.be/userfiles/files/xojakubajimijuw.pdf
    • http://bjdfszwy.com/filespath/files/20210921080614.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+call+recording+app+for+samsung+a50
    • 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_off0000b266.bin
0a05b6021c79f04ee8fe456748bf2676dcf72d121e686fb7ff5d11d6ba96e886		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB266 11372 bytes
font_01_sfnt_off0000cd01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD01 16792 bytes
font_02_sfnt_off0000e513.bin
743020018f401afb13525b9c1cd48bd2d0da102806da9981bd052e4fb9cc633d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 14540 bytes

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