Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf3bb90be6ba2d4…

MALICIOUS

PDF

72.5 KB Created: 2021-09-28 16:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 86c941708fc643c352ac7bf34286271e SHA-1: e3bd8e94f46c358683c0ccf23592875367519663 SHA-256: edf3bb90be6ba2d4e877e921a072c75867d03747573bf7d6a09edd4aba1fb6de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to redirect users, likely to phishing sites or malware downloads. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://naturpix.ch/cmsimages/file/55759725005.pdf In PDF document text
    • https://nurdagihaber.com/resimler/files/tusuxaxaxud.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/11355725417.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/43323350130.pdfIn PDF document text
    • http://quetthe.com/upload/files/28693649737.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/jorijomunubumipe.pdfIn PDF document text
    • https://schmitz.cz/res/file/gaxebawon.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/togikimem.pdfIn PDF document text
    • http://husplaza.hu/editor_up/61086210632.pdfIn PDF document text
    • https://denis-lefebvre-services.com/fichiers/file/53018193416.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/vefogidopix.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/22536753639.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/9395739247.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/96431243299.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/42423466048.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8af73b5da---26628243564.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2ddb720249b62fc6546b6085b7e2f48c/65939018003.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/69171394922.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/86772810210.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/8374361023.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/vokovisexujabugoga.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/nixoba.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/bokorewanure.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/zubenilopanoxekowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=firefox+plugins+androidPDF 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_off0000b585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB585 17768 bytes
SHA-256: a4fdb61d4fde887543640a0c4ccedfa43523a1db46b0fad62bc1707a9c4f96aa
font_01_sfnt_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 10752 bytes
SHA-256: f1ece46441bd65cd9c44f447e1a3d8452e3c24a7619c34bebb1e636d3c799fc0