Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c313957bdb93bdd…

MALICIOUS

PDF

75.4 KB Created: 2021-09-17 22:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b0883090e39f55794210c4d1c7c05e8e SHA-1: 3c485a9cb4e852130e163c8397cc54c0f84d6c6d SHA-256: 9c313957bdb93bdd98cde074b4d14ca17610e82e709e40d825d55766281bc2c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure itself is also flagged for SEO link farm characteristics, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://northwestconvention.cz/data/files/27852189605.pdf In PDF document text
    • https://perfectprojects.ro/userfiles/file/66981848324.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/tewodafugezejofake.pdfIn PDF document text
    • http://turnyras.lt/Files/file/xexaxateso.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e5af295ee---texumix.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210903093807.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/sufenuxileduxo.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/30591833395.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/xotixirumoriwivow.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/31730819557.pdfIn PDF document text
    • http://keacg.com/upload/files/tojutotemoniwaru.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/tapegetizazufumirovul.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/misugewidas.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/zavezigavav.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/vikinenap.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/487081827.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/88847059353.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bowutibab.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/98667149434.pdfIn PDF document text
    • https://anaksemut.com/contents/files/rigiweguda.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/88407357946.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/20576279492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cr%C3%A9er+un+groupe+de+contact+androidPDF 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_off0000c038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 10760 bytes
SHA-256: eb2fda0214cef1dad51ce0197d13111e9f0fea2b4393c1f29523133162f0da6e
font_02_sfnt_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 17860 bytes
SHA-256: 59534e275e1dedf64bfd84b172d00448b38c341f6056ce13adc921bcdabe2f97

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