Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75d86eb469c4ead…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 08:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06764b3446ed6de5f84e029b43dd6455 SHA-1: 7eb4420ca7db4e29b46a6192c0b401539c03eb39 SHA-256: c75d86eb469c4ead4f5fb003af9d2aaad83a4a37ac8674e55bfc1cefa1d78ea2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed as a link farm on disposable hosting, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=apk+messenger+lite+download PDF link annotation
    • https://titishop.co/upload/files/59971646219.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/siwamevuxomole.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/69756495415.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/51832080089.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/28991444243.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109152333456696.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/77432375011.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/13594433837.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/gugefatimivalulekis.pdfIn PDF document text
    • https://akconta.com/uploads/files/vinujuwuzomalupobotafok.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/xuvoj.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161453945661ba---kuvewijilobeto.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109141651550879025ybegf.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/tedikuridiwukovagu.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-12-21-13-56-yoVNPw9K.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/wesizovabejibovov.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/xubevav.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/50965170027.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/wutusevovoratovukomonufop.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/marimikanimo.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/wijegokufalomurixarimum.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/gogav.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ojf995ukrn414d0fjr3us3h922/3072151211.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/5257957525.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/92055729601.pdfIn PDF document text
    • https://ekransamara.ru/files/16654939319.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_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 10896 bytes
SHA-256: 3ba34d5fa433eb39f9b38f7170bcb346a683ec6d660bfeaa9914ece082e50df9
font_01_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 16708 bytes
SHA-256: 49478e9965854384c2ccd65ffbe57ce92a0dfe6a015beac07729bf2d21cc0d37
font_02_sfnt_off00012634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1