Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce305c136d639de0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 23:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89f39d301bad6c9712f0219b9b70b209 SHA-1: 5beaa85001ef43c4a42ee4bb38d618890ab7fdf1 SHA-256: ce305c136d639de0d0652e0e0edb6daef6310bbc19c0bdca01901491f483f9ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm designed to redirect users. While no scripts were directly extracted, the presence of external links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest an intent to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nanumed.ro/uploads/files/pibavakipimisefurat.pdf In PDF document text
    • https://sofupingame.net/calisma2/files/uploads/6826409443.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/sunevusezafitisebevuv.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/jarapoxatebifinukokajifip.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/99f5fac86942d19a5a67fb844b749fff/67240850950.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/wamutef.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/63943919129.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/nupireximibobozabut.pdfIn PDF document text
    • http://m2m2design.com/userfiles/zazubuzevu.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/39210607645.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/jedalitazuxevitovedago.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/zexubewugeg.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/26719826342.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/nalunuludi.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/mubanulosesof.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/gurebozimi.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/17323166500.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/82956782712.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/8373010299.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/73666011596.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161371b222ff59---gurumavavuradetuvugilo.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/napefikinan.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/25705590778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=turbo+followers+for+instagram+mod+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_off0000d4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 17204 bytes
SHA-256: ee2f3a8fd26da5aad60b76e1333890c172134d4ab01384379dba2bf925cafe6a
font_01_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001192c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192C 11220 bytes
SHA-256: 5dc4f0a9d50dc1f9972906d6c291db7bda053e9b5448649f5f875e9ba8a186d0

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