Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6f0349f6d33af9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 01:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 732475f0d913fb1657718141c6bccc0c SHA-1: fe93922902a31a9286a476f221a0035a3bf82cd0 SHA-256: fd6f0349f6d33af99de11de28b0061bfd8920a5b3fa8a9f83460d1e5a4cf27b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit vulnerabilities or trick the user into downloading further payloads. The embedded JavaScript is a common method for initiating such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tradingphrases.com/userfiles/files/rorisawugepozujezat.pdf In PDF document text
    • https://dnm.tw/uploads/files/202109030058462640.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/20499740875.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/57081118300.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/66053354855.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210911_184724_172.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/21962370122.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/61435874240.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/fekopeporabewexekusibi.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/gojofabefid.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/vurunexebujigileb.pdfIn PDF document text
    • http://klhl.com/userfiles/file/42323618901.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/kemam.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/88194344125.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/92148455924.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/7180523337.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161375611b720d---40424565971.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/tunabanazogekopiv.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/mogebusobekapes.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/vasobawujex.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/gulijakilovedufemezi.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/guwimiwasotip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gameboy+advance+android+apkPDF 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_off0000d6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FE 21740 bytes
SHA-256: 978769bb82d87e7f0385a0fb8819379b324d84126f698dcf3c60c5c08d48a913
font_01_sfnt_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 10812 bytes
SHA-256: 1186bca4169d8c68d962cee03f2a198446285b7588d4ccb37e8dbe75d60645eb
font_02_sfnt_off0001294e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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