Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdada55737946001…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 22:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7995c7d963ed6f3b50dde4b464b69e0 SHA-1: 7080ac510cb9ee98f365b19118b6c250163b6e86 SHA-256: cdada55737946001aeded063f0a5dc4b0fbada042512f18e61edab82aa3b15cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a large number of external links, suggesting a link farm or phishing lure. ClamAV detection and ML classification strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://webinaris.blog/ckfinder/userfiles/publics/files/43489942689.pdf
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/10076605271.pdf
    • http://iccjsc.vn/images/uploads/files/36397195598.pdf
    • http://rosesrealtyhomes.com/userfiles/files/46674953133.pdf
    • https://ustunbilgisayar.com/userfiles/files/malomegabefopiserob.pdf
    • http://electrogalicia.com/electrogalicia/recursos/archivos/82775391926.pdf
    • http://geteffective.biz/uploadfiles/file/boreki.pdf
    • http://balone.net/_upload/file///10016182213.pdf
    • http://www.anaja-inter.org/public/file/82988239242.pdf
    • http://sartor.ru/upload/files/4624050099.pdf
    • http://wolfroccatiassociati.it/userfiles/files/45670647662.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/gizowipozazexileripuro.pdf
    • https://kingwrapcarspa.com/upload/files/xofunamudoze.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/36317170397.pdf
    • http://nanouklid.cz/upload/file/zevixowiv.pdf
    • https://aprilboya.com/userfiles/file/kidifesejoxebekoxejulelo.pdf
    • http://massvt.sk/editor_uploads/system/files/pakiri.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613347289cd07---48731589114.pdf
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/wadenarotabewubi.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/94a1031fee7bafecf2785225ef67a534/wuken.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/62194406072.pdf
    • http://rococosofa.com/files/files/35933638396.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=maatr+movie+watch+online
    • 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_off0000dca4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 16792 bytes
font_01_sfnt_off0000f4bb.bin
e6d93b65e0126dd695f1142bc225a6edbc39e3f03eebec8c86474c5929ae0ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 10472 bytes
font_02_sfnt_off00010c60.bin
92c3d2e917d689d1e57827a74fba1432510208ab57189be55e51082832a12410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 18640 bytes

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