Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb04d525648187cf…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 22:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e6297b2b33a64a84f74204bdddd8e56 SHA-1: 154c6f123280e256f073cf6b729659de7f631652 SHA-256: fb04d525648187cf58ca2c1b631ef8c3b19159d473a93dca2fdd0eb2fb3f6fb5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=how+to+hack+someones+instagram+account+without+password PDF link annotation
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b36cad58---77522578953.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/34167290794.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/46046525937.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/tifonato.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/fozujowijezerufe.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/4788802312.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/74525908336.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/zuwuvafifixemosixulifexis.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/50222132387.pdfIn PDF document text
    • http://hotechike.com/files/files/pusuliwesefutobusuremuj.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/5652475212.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/14307338113.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/68074349625.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/99071306356.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/71357910671.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/pitepaka.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/kokubiburuvuzoxixisapu.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/95043319402.pdfIn PDF document text
    • http://iviltra.lt/images/files/xurapoketabo.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/vegan.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdf9d79a62---73667437048.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/14493103996.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/67179480818.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_off0000c1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D3 17336 bytes
SHA-256: f820bafaabbceada06529bff066c13bac4823bbea37a9f0a3878910b88637286
font_01_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 11184 bytes
SHA-256: f4b5c3c3c0c0c84750740d417d370e32e3023df7000ccd0df70313b59ef92746
font_02_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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