Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bc0dfa716e98f1…

MALICIOUS

PDF

80.3 KB Created: 2021-10-09 14:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c850ac7b2df41d19c45b599f1dbb9997 SHA-1: ab0be309a78592cec36059f548ef1948e4cff6ee SHA-256: 52bc0dfa716e98f12299d96044b018231d9e8553cc8c69133326578805a30521
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 pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to redirect users to phishing sites or download further malware.

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 https://catamma.ru/uplcv?utm_term=how+to+cut+out+pages+from+pdf PDF link annotation
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/gegut.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/204c83b031c696858f9095ebb30eae73/93267541658.pdfIn PDF document text
    • https://hinaweb.com/upload/file/dedukezawuresipoke.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/doredizudozaradux.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/22405962305.pdfIn PDF document text
    • http://pasarantogel2.com/contents/files/nelopovijotefopodoxodeg.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/34574407477.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/tusagowevisavojefudezis.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/47659561283.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/bisixavato.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/41980805654.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/83848886017.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/16182211864.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/51834516445.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/soguzoxumuvix.pdfIn PDF document text
    • http://lecostationery.com/files/file/rifuzikatapelisoruku.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/1397713841.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/karuw.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/94281256925.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/76805879843.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/jamepevotomubemeposudedig.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142156951d35---zopudowetetumosibuwu.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/9415337084.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_off0000d32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 10896 bytes
SHA-256: 2c1755a60d8f25330d035563e2f94897ba4729c21ba0b2d9282d5520bf3860da
font_02_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 18240 bytes
SHA-256: e9e5b7d31fba1675a1a36f3a3206dd5cc90bc54c54e9337da045243f0de98e8b

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