Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31f354f2cba87b5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 12:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88c5af9f72fa36b75e563ab494dc9de5 SHA-1: 948a74eac6b8e85702b59b44155b94a13dc53459 SHA-256: f31f354f2cba87b511913da0793afa88769252f620c28e7845786ca97d827397
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The presence of these links indicates an attempt to direct the user to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://projekt-lesen.de/userfiles/file/95385399053.pdf In PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/rapivowiv.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/xewitexiburafapakari.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/82071517123.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109070648114857.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109191050158933.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161392f61c4550---jinobimojomalojoxotakew.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/66a6023d1ef60fb71e73719eb9ab99b3/94231976318.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/zakivoli.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/peruras.pdfIn PDF document text
    • http://thaide.org/userfiles/file/79085579929.pdfIn PDF document text
    • https://verner.lt/images/files/89811332675.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/geniwarezutusifezad.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/temuzozozuxisawela.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/11523636747.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/87729925693.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/korewekazojobuniw.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/57974051141.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/74213976673.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/depojimodotot.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/gitajurizuk.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/vamaxepib.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/31954385583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=principles+of+heat+and+mass+transfer+8th+solutionPDF 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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 11196 bytes
SHA-256: 065c82ba4ce1b1628ffb1a65de56f2d9104f3eafacec770b14c348e41badbeec
font_02_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 17612 bytes
SHA-256: c046d36a23fbe20298aefb2105debd893aff45ecb3f0033da0416bac6c452097

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