Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8dd562418db6d1…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 12:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bb702ff2ae29b1e53ff5978e672696a SHA-1: 27846395c357651eeec49acb61ee7e7daa351a68 SHA-256: 8f8dd562418db6d166dcd64f0d1a6ef02f2a58b5e4a9c1da207c314a77c514c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dogathermalhotel.com/resimler/files/giminu.pdf
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/65386852731.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/gesileberamenepes.pdf
    • http://mjacz.cz/soubory/files/21354152650.pdf
    • http://pivotal-technologies.com/userfiles/file/rixixenigajedim.pdf
    • http://sevenseahotel.com/uploads/images/files/57173454409.pdf
    • http://benetalent.com/upload/files/zuxodisuzener.pdf
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/73138198578.pdf
    • http://hotechike.com/files/files/14436472249.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161442e85cd56b---zutosadutijofuwixa.pdf
    • http://le383.com/uploads/files/40170380547.pdf
    • https://altsovmun.ru/userfiles/file/libipizoguzadoxetani.pdf
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/kutadirirurana.pdf
    • http://autoscuolepintozzi.it/userfiles/files/rajadovapamubikipaxunu.pdf
    • http://deleersnijder-bocaege.be/images/file/zinevizomagosulikerozile.pdf
    • https://frigosztufi.ro/ckfinder/userfiles/files/seveliwexeb.pdf
    • http://www.chubsorn.com/file/files/nopilirijexalesidu.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/mejoparidogujumuf.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/22257601470.pdf
    • http://ginzaramen.us/uploads/files/5684242951.pdf
    • http://sarkar.ie/userfiles/file/39301307768.pdf
    • http://diagcorlifescience.com/attachment/file/84965865919.pdf
    • http://mh-gartengestaltung.de/userfiles/file/kevetugavowi.pdf
    • http://wych123.com/upload/files/sizebenujub.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/7c085610228bc53b514c44a248717a0b/48146409878.pdf
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/wixamawotobizotavabaz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pregnancy+rujuta+diwekar+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_off0000c671.bin
d43e4ea4a775a6667c8a8914d50ba4207ff6a5140e3dec00311b8492b61b5a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC671 10984 bytes
font_01_sfnt_off0000dfee.bin
77e353100c2b41c0606514059ebb081809933b4e956eb3fdff9731b94d80fe3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 17132 bytes
font_02_sfnt_off00010b97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 16792 bytes

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