Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d03617c07c9e54…

MALICIOUS

PDF

85.3 KB Created: 2021-09-14 07:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 35ba10e7eec6f4488c87ad64cdab5524 SHA-1: 4ab5c7e84fb80461c9dd31f0291a07df09206440 SHA-256: 44d03617c07c9e541fdde8640fa4c7e63cd20277bbd76eb201e4ca986d96b269
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

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://vargyasnekonyveles.hu/kepek/other/file/80734621994.pdf In PDF document text
    • http://terremeraude.com/userfiles/file/fezujamofejiwatoxeteboz.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/tales.pdfIn PDF document text
    • http://leguido.net/files/fudabadikituxenuwew.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/kobinunesigutata.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/44209640605.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/19436986089.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/josaxelikefexopas.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/60071317077.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/zegipubofof.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/78hte8uhto0tinv49erhe8p5ki/46106964126.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/loxamiseka.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf174ea28c---jaluzadenarolefazupovaba.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/30968138043.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/68512703057.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/pazutun.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/62047790600.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/54345324102.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/78911858463.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/53867855208.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/81726110644.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/6237116083.pdfIn PDF document text
    • http://geoman.cz/data/file/96361396516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+folder+name+ideasPDF 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_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 10400 bytes
SHA-256: 2fefd74e8a2920890164259a334f4f6f56146ba9705169e8d7ecc429bebfec0d
font_01_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 17996 bytes
SHA-256: 967af3456a8bc3c5b6bccb3634b8110a000378d20aa110fce1079aacd7297a76
font_02_sfnt_off00012f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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