Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3472d76b9183eeb…

MALICIOUS

PDF

67.9 KB Created: 2021-09-29 04:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c4127f6bb7c548a387054729abd31ff0 SHA-1: 85cc9aef9d47b11f0e4a6ccd5e983d62edba2988 SHA-256: e3472d76b9183eeb91ace73c2de94785d200fabd2906da42575405b4e2b9a1df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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.
  • 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 http://lobi.md/userfiles/file/mudipixavis.pdf In PDF document text
    • http://caogenzhiben.com/filespath/files/20210923080430.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/969c8d5fa73912a3e7ec451a756e30e1/70878263546.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/3619562999.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/falozoxuxekorowo.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/55781831131.pdfIn PDF document text
    • https://bunianco.com/other_files/File/pawipadixebol.pdfIn PDF document text
    • https://terracell.info/images/file/fozadiverigimurajaxojizi.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/xenajuloj.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/gelaxasezefejus.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/12621050441.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/gimizusanogatuzigabewiba.pdfIn PDF document text
    • https://t2sc.me/userfiles/4521958183.pdfIn PDF document text
    • https://bloomeng.com/uploads/besewob.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/vuladowibubonosa.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/xomunisimuzumiganoz.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/28569150941.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/nokafevamemijomuxasorat.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/20808221235.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/81170003216.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/dabisudu.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132bcac5975d---45165179335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=top+10+websites+to+download+bollywood+moviesPDF 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_off0000ad0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0B 14380 bytes
SHA-256: fcc5c589cc3d3360a0f31fd1fdfcd95c75ca9129e1ea48c2db8cd3610fea8378
font_01_sfnt_off0000d0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 10996 bytes
SHA-256: 39673d8a20f85cc5a2ce3db40a2790159425ae57384572ace03c5f9cbc197950
font_02_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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