Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a267cf9dd3018ba…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 18:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7e0e6faf3b98eec8b2e81798b99c0aa7 SHA-1: fcaa70dfd940c18250ab608ae1cbbd065d62bf7d SHA-256: 0a267cf9dd3018bad6b4a7a40a7d59de6d087c4efa6299b08bd74b5ecaecb734
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including a critical ClamAV detection and a high ML score, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=extreme+car+racing+apk+mod PDF link annotation
    • http://fullx.net/files/zokusigu.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/karawoseja.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/90927645775.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/90962960284.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/sefaporipufukix.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/pewiwowatujutafedo.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/rufigemofedirazobuganekel.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/wibowezupiruxam.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/68311374097.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/fedinezakeranotosow.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/fonovezesunamoxigef.pdfIn PDF document text
    • http://szm.hu/userfiles/file/23459660519.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/51958681182.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/kamefovokovivojas.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/jenijidedu.pdfIn PDF document text
    • https://tarsiman.ee/files/file/kafegi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161351207b49b9---rejasavofobuwuwe.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/47198154850.pdfIn PDF document text
    • https://tigapilar.com/upload/files/vegilifiwotilu.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/47654389865.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/96268819346.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/modifutiroxeko.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/somixuxososaboru.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_off0000cd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 10820 bytes
SHA-256: 608c3d1323df8e808d2c4ab83c4f831c66484bffdb04e8f3f87ffa265c05c9d2
font_02_sfnt_off0000fe1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 16540 bytes
SHA-256: 7b2c41e5b616d94a76515f9d228251b3aa8ca98ddfdd1b2a18e11f121aa06ce5

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