Malicious PDF — malware analysis report

Static analysis result for SHA-256 6769d36f636bd1a9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 01:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 554830370b47482c2256fc6902ebf93e SHA-1: b473249ec3ba7305af62dbd14fa1dae7044a9af6 SHA-256: 6769d36f636bd1a9fe60e47ab232e4ff44eb1a151acce934caa92195baf3e78c
134 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 potentially malicious or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

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 https://limblength-sldf.com/userfiles/file/vijowubosid.pdf In PDF document text
    • https://nevisnews.com/userfiles/mutofonotib.pdfIn PDF document text
    • http://insei.eu/userfiles/files/68108196489.pdfIn PDF document text
    • http://brlairport.com/images/file/tulame.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/dotupobunegipanisom.pdfIn PDF document text
    • http://abwrva.com/uploads/files/31728599742.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/37933978176.pdfIn PDF document text
    • http://kustari.net/userfiles/file/59022144407.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/8489297783.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/tidajumukifulivibi.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/tides.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/aca7e06d8618f78a39ec7c435458ab4f/80377785532.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/busuxogezip.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/16537254619.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/17606635364.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/jedetogoga.pdfIn PDF document text
    • https://coil.hk/upload/files/54154928520.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/pasaxemu.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/zapisotemana.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/lurosezukivalikaxomezijom.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/konafubatixefo.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/77625175808.pdfIn PDF document text
    • http://byecook.com/ckupload/files/joxilub.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614661cea5825---87992985242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+croods+2+for+freePDF 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_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 18768 bytes
SHA-256: 2d7ee95ad611293211721c71ad886298b9fe806f816832375e6c393152f23311
font_01_sfnt_off00011d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13587 10444 bytes
SHA-256: 7356d8c2554ea835875f1e140ed7c1a4eee096b06ec0e94cf3f51d0bea5267cc

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