Malicious PDF — malware analysis report

Static analysis result for SHA-256 a057329a1b7f26de…

MALICIOUS

PDF

69.7 KB Created: 2021-09-18 14:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3daa879b0a356f2ca07069ece05669ea SHA-1: 2a37831007f60a12c747133c338375876aa38007 SHA-256: a057329a1b7f26ded72def2eade86ef4560a4516c2c79e282b5c0b8c1ebb4d80
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_RANDOM_URL_LINK specifically points to a suspicious URL that likely hosts a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://tresonance.org/uploadfiles/dagab.pdf In PDF document text
    • http://sirinthepgroup.com/userfiles/file/33025624327.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/14156285486.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/pogalojuzara.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161386b730de04---penagifor.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c7b0021b5---64781847186.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/84132628706.pdfIn PDF document text
    • https://ikansambel.com/contents/files/dolizuwerakujazitapuvev.pdfIn PDF document text
    • http://vtaky.sk/media/file/84882335537.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/35988242652.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/48854610402.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/78912686712.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/subamamelijamotidisaked.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/xamepibujeluk.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/57425683928.pdfIn PDF document text
    • http://classtool.info/upload/files/60371970462.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/48318587843.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/82295854726.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/38634521873.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/3365795479.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/91826890051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+all+world+flags+pdfPDF 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_off0000b217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA29 15308 bytes
SHA-256: ad6cd1183ff84e339e52e308e32f5d5fce68ef4285a17754a4a4241536a3e485
font_02_sfnt_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 10440 bytes
SHA-256: 5751c30bd7206ff140d96c9a75705f1c12439f6d8f08c9ddd793c53ac2789f03

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