Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4bc2896cec8566…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 07:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1d62859b9e23e6d6350e816d710378e SHA-1: 105f25c7fe3d3affcc14ce963255005d85b9a44e SHA-256: 7c4bc2896cec8566c2976d930d68fde77e294734950940a6462315c16c06e929
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=split+screen+apk+for+android+6.0
    • http://rotang.net/userfiles/file/tapisidodexepavigol.pdf
    • https://marblobath.com/app/webroot/img/files/92544718778.pdf
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/38167549829.pdf
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/87058809528.pdf
    • http://deepakbatteries.com/uploads/file/26467280272.pdf
    • http://heyumpnd.com/userfiles/file///49937100738.pdf
    • http://getvisa.ru/images/File/12538089641.pdf
    • http://jumpstart.mobi/ckfinder/userfiles/files/labeza.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/30003524247.pdf
    • https://dpengineerindia.com/admin/userfiles/file/88113647261.pdf
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/7439163893.pdf
    • http://www.pes.edu.mn/ckfinder/userfiles/files/84288578142.pdf
    • https://j26clean.com/upload/files/gimexugisaf.pdf
    • http://thamcohoaian.com/webroot/img/files/tizurusidu.pdf
    • http://datavincity.com/uploads/ckfinder/files/didosefoza.pdf
    • https://nirkongrp.com/ckfinder/userfiles/files/11813546469.pdf
    • http://njbeihang.com/uploadfile/file///2021090414050483.pdf
    • http://joltiy.ru/uploads/files/35747294126.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/42988986269.pdf
    • https://ymvii.com/admin/upload/files/rironifaxibaruvumifowe.pdf
    • http://www.cddfct.com/up_files/file/94910310206.pdf
    • https://alternativecarrepair.com/userfiles/file/wukopokapamusoretir.pdf
    • http://zdrowejaja.com/Upload/file/39124319988.pdf
    • http://terezmisszio.eu/files/file/82201953920.pdf
    • https://autoteam.in/ckfinder/userfiles/files/44991506488.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 16792 bytes
font_01_sfnt_off0000f0cf.bin
a79ffc084f6cb30d9e4292f39f743d4666ee63b89e999170a7ab2a12c7042c42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 18500 bytes
font_02_sfnt_off0001212a.bin
7be4d2797947b690ea13be622f75062c69bfd8625be16ad5121d9fc28aabd0d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 11136 bytes

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