Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4f8fc3f3d17966…

MALICIOUS

PDF

68.7 KB Created: 2021-09-08 13:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d501dd62a3c0f4ee07fff58f41fc037 SHA-1: 3eece3c7c692413023f48644dc06e4986bbb5b9f SHA-256: 5e4f8fc3f3d17966bb1fcb554d33ce357c7dfeaf5df1c44197e3ae992ab950b5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bzws.zhanyougame.com/ckfinder/userfiles/files/xigobirox.pdf
    • https://vzglavniki.net/data/file/fatabujes.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210903_ACCABE28A4B0E4BA.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/42070055877.pdf
    • http://stillincontact.com/images/mails/file/17087695596.pdf
    • http://gdfsztal.com/uploadfile/files/paworevux.pdf
    • https://saglamahsapkutu.com/img/editor/image/file/97660527290.pdf
    • http://sungsam.net/userData/board/file/vutilokemat.pdf
    • http://kaus21.com/userData/board/file/47829757110.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/kobodiga.pdf
    • http://twtime.com/uploads/files/202109010716101061.pdf
    • https://galerieportelouise.be/userfiles/files/34822348157.pdf
    • http://hondatayho.vn/images/ckeditor/files/73278899234.pdf
    • https://mandarinusa.com/userfiles/file/1631089109.pdf
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/77097242099.pdf
    • https://marblobaths.ph/app/webroot/img/files/20132366656.pdf
    • https://vibanghanoi.com/uploads/files/binodagomoxuguxigixivi.pdf
    • http://pololanna.com/user_img/files/44878901236.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138168d26c85---24611370341.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c9cd33139---9170505524.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/dulivuluva.pdf
    • http://premiercontractinginc.com/files/file/57189913803.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/njr4cm2dg4a69karrko8gq78c2/mugipajesu.pdf
    • https://websbag.com/uploads/files/39918335990.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=masterbuilt+electric+smoker+user+manual
    • 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_off0000aff5.bin
3a3591eb5a739fa62166abeeb918d0ff77f3809f9726e8c227d434c89f9f94eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF5 10716 bytes
font_01_sfnt_off0000c891.bin
a29fe4cc46e5f0fb880ce40fee30c9dc3c1c4189caa5545b2b774bfab3a106f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 14900 bytes
font_02_sfnt_off0000ed1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 16792 bytes

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