Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f8e294395b297d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 11:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5376fc27b540bbf88ca3f50c35156ca9 SHA-1: 5cf419ee10cec11b9c5dc8c0c4886b5ba9f69bf2 SHA-256: 83f8e294395b297d51146557cc12def6a6a12e3bbd28afe1232cd0c2e7025df7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=good+games+to+install+on+phone PDF link annotation
    • https://sukienmiennam.com/userupload/files/zupetuvajonodir.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/68280124242.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/33718670752.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/lunexux.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/68746176740.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/muvusegatogeluwuruvopasu.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/sujowulebisolusemibo.pdfIn PDF document text
    • https://servicepapik.ro/files/25333693890.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144eaca5ea0a---30809645851.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/zitoketitadovejeriregiso.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/vawukerenuvu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613889182a8ef---64580364214.pdfIn PDF document text
    • https://oasis-travel.ro/files/busuvobuwaw.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/71808873388.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/4555598998.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/texejoxavub.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/venipu.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/mituketidoj.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/vutijimuzumutivugifu.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/56753667798.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/bekidu.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/deweba.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/jutemu.pdfIn PDF document text
    • http://okun.su/upload/file/vilizovuwebajif.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B6 18060 bytes
SHA-256: 091a05de663ca8485f0fbfa12c04438373122e19c0f317ec6665cee23eb3a126
font_01_sfnt_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 10780 bytes
SHA-256: 025c72d437e020fee79ec7932685283a3290ba737469f61d86a20a961839a518

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