Malicious PDF — malware analysis report

Static analysis result for SHA-256 640e3d7412c59805…

MALICIOUS

PDF

71.4 KB Created: 2021-09-12 02:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5b8680e0ddfdd3694afe2d88c80cfb7 SHA-1: 59ab3460c54060116cd886cac474b1194a5123ee SHA-256: 640e3d7412c5980596b9c223a3d473632f0a008e8e707cabf3cf374ae7cb6da6
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=demon+slayer+kimetsu+no+yaiba+movie+stream PDF link annotation
    • http://creationart.hu/files/file/72839478676.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/85753002015.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/94069128349.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/gajogidozebiv.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/78317355966.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/66844055339.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/34095219308.pdfIn PDF document text
    • http://kbchina.de/upload/zukexemew.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/5682382320.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33a44e6b1---60051087216.pdfIn PDF document text
    • http://kd-council.com/upfile/files/ranijokufagifugoga.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/38166720293.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/79665308483.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/somos.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/19319172791.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/73724488845.pdfIn PDF document text
    • http://crm333.com/documentos/file/ropipadedezozar.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/jutot.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9991a24f35c00a8e1902ab2b25e83c54/3328033476.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/sixobowigomivula.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/vugegaruxivo.pdfIn PDF document text
    • https://kaparatt.com/images/File/tedijati.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_off0000b419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC30 10784 bytes
SHA-256: cb9dbb3862f44f30b4465f8b13d0e6f55060db45e1499666ee15b2af30db0929
font_02_sfnt_off0000e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 16664 bytes
SHA-256: 110b574b0369955e0ad20f262fedb9d37bfd4128c2be28e937ce4f6e018394cc

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