Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e7aa70923bb4e7…

MALICIOUS

PDF

69.3 KB Created: 2021-09-18 06:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9931138f2392fe2bd4cbe861976fac7a SHA-1: f1ae7792f1d9f1dab48c757dc4c75f807e51c6a2 SHA-256: b4e7aa70923bb4e75c537ddc16f313f2a6275604cd061884237de6bb1865b68b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. This suggests an attempt to redirect users to malicious content or phishing sites, likely disguised as software downloads. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6326

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=god+of+war+apk+offline PDF link annotation
    • http://galeriejacqueselbaz.com/userfiles/file/waxugug.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/7001115786.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/23383524732.pdfIn PDF document text
    • http://pneusmarene.it/images/file/40423429761.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/91231730914.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161424566c9fe9---tikajozajamugurasejususo.pdfIn PDF document text
    • http://idroter.org/userfiles/files/13075167296.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/39375075797.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/wulefusilasenu.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/genoxakelifu.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/makokibawejagawapad.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ba52778c4---keben.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/zevijukugolebuke.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/57515144506.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/davipivef.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/wekinedip.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/zafazaxaji.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/75230834348.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/muparubilubopik.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/419091322.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 10440 bytes
SHA-256: f3ad4271b62cd33c37e305ba704b309b7145a7ab6d6e8fd9d28b97031d4b6806

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