Malicious PDF — malware analysis report

Static analysis result for SHA-256 964ba03cf6d105be…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 07:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 69096a405bc4a10af17966b55edce26c SHA-1: 7aded5fa4e32ff8b1573a038582573cfc30b5fdc SHA-256: 964ba03cf6d105bebddd595fb3eba274867d10b8e237154c5790f289a58cbb33
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and potentially a password-protected archive lure. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631146116.pdf In PDF document text
    • http://madiagranitosilano.it/userfiles/files/gefetozukuwokafin.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ltv82i684the47vq6o4j3boa6b/84143907451.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/93556200184.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/68979642294.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/viwijudabinixorolune.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/67305402750.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/bonanewagiruvawovolitew.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/bebowasegulajukukuxipipez.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/15681349420.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/85495418928.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/2143920285.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/tosorasawezaz.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/69756822060.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/larezufisaxo.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/29799082742.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/23361060444.pdfIn PDF document text
    • https://produse-zilan.ro/files/40658734016.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/lowifof.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/zuvodavorixugavu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9adaba48---8710410481.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/zowuverixikesuzevolafad.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109151804303010.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/52426289521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=screen+lock+pattern+not+workingPDF link annotation
    • 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_off0000c865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC865 17940 bytes
SHA-256: ea4a03d3f0b6c58ca85aae208112b8bb819b64b14c90fc100fc626cac543057a
font_01_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 10636 bytes
SHA-256: f5b2b0b49792eb89bf8f38ffa57ad7926efa25d38964bc6316b5ac563d7349c8
font_02_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1