Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ac9864d5be80df…

MALICIOUS

PDF

95.3 KB Created: 2021-09-06 23:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 330080b59438bb18ebca9fc174d77143 SHA-1: 62b451bb9124cfbae6530e9c6a77b5cacef75bfd SHA-256: c4ac9864d5be80df946701a8a8920d6f016695d341eca544aa8cf760539ac3e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://investmentskillsgroup.com/images/userfiles/file/xafobomus.pdf In PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/48293306835.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/47018340641.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/oanprbhc3aqlrg40738ohrsej2/86297141235.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216222221551315.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/novunosatasawubik.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/masisopobojer.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fb86e32a6---pufikivowezugilofolaneki.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/62404299968.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/96911509546.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/bifipovorewoxawoloval.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/sisamiwemovulofoxufozu.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/76041171805.pdfIn PDF document text
    • https://htchninc.com/d/files/tubago.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/21105385120.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/gawapiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=thomas+more+utopia+book+2+pdfPDF 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_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B2 18740 bytes
SHA-256: 5ceef4e0f6719cd65a95d758a6c726c2cad31a00bfe7fbd744fc06982ae70f86
font_02_sfnt_off000156d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D5 11028 bytes
SHA-256: d27ca7f8d0453097206c77a4e91292b498d0db5d302907170bc4d89bfef27073

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