Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a18d6b307d70f42…

MALICIOUS

PDF

71.0 KB Created: 2021-09-19 15:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d18794dd0da6ecba53df1ac88d5c51be SHA-1: 67f5d599581b9afb6b131823a43cfe978492803d SHA-256: 4a18d6b307d70f42df9938898db27f2dd5dc5e357a622da70a0c31cdd8934567
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the document is part of a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://infrive.ru/uplcv?utm_term=download+game+gta+sa+original+android PDF link annotation
    • http://rtm-plus.com/ckfinder/userfiles/files/85273913350.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091711002873499.pdfIn PDF document text
    • http://hasyo.net/files/file/54001205705.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/wujewatifavubizosuxima.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/vebajeruxibuke.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/93321347544.pdfIn PDF document text
    • http://egitara.com/upfiles/files/23976302619.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/nagetedesezuxixaferagus.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/taduzozuralesikobavukow.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/gubagigax.pdfIn PDF document text
    • https://ka-base.no/images_content/file/74359677418.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/45411741283.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210911file///67289908475.pdfIn PDF document text
    • http://sergeybazarov.ru/file/39699322261.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/29942633585.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/49883904097.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130401f98a41---85473204239.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613984816be77---temozipipuxim.pdfIn PDF document text
    • http://cartopack.be/Images/file/80925638263.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/bovezesugo.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/xokumusufabobuv.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_off0000b829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 15060 bytes
SHA-256: 7f0d5aeb740ff22e2127a5fecb35e4167d521953cb2d200ebb8c60b8ae1a9f33
font_02_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 10680 bytes
SHA-256: 0e747b39a7c4d36498d2a36f7603732439568c0500e6172e4f965ab84378a175

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