Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f68c2f83e18c51f…

MALICIOUS

PDF

34.9 KB Created: 2020-03-25 14:04:24 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: aa44bd50109f6bc5a36697b222974730 SHA-1: 68cf519578169afa71a339e23acd34509495f8ae SHA-256: 4f68c2f83e18c51f52073db2ac712e163a7246bf5cfd061feec5daf08cf740f2
92 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though partially corrupted, includes the text 'Father brown mysteries cast' and references wkhtmltopdf, suggesting a lure document. The primary intent appears to be directing users to a network of websites, likely for malicious purposes such as phishing or distributing further malware. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://healedonline.org/uploads/1/3/0/7/130775391/130775391.html#father+brown+mysteries+cast
    • http://anacondaprotocol.com/uploads/1/3/0/6/130639877/5239887.pdf
    • http://www.yogaisanattitude.com/uploads/1/3/0/4/130493893/faxemamozuk_vovanev.pdf
    • http://nalbarra.com.au/uploads/1/3/0/5/130590310/woravuwuxez_fapopewiwesa_zajisu_nirupugof.pdf
    • http://wagnercottonwedding.com/uploads/1/3/0/8/130814338/7880190.pdf
    • http://www.wolvesofgrace.com/uploads/1/3/0/7/130739885/db5f28a88d69.pdf
    • http://workuemailprocessing.com/uploads/1/3/0/7/130739628/julanupe_navobirenijuzef_xekozedadagu.pdf
    • http://www.homeeducationcreations.com/uploads/1/3/0/2/130272877/2b559e7f186f810.pdf
    • http://pricemedicare.com/uploads/1/3/0/8/130874543/1332279.pdf
    • http://dirtylittleclaws.com/uploads/1/3/0/7/130775278/6421169.pdf
    • http://mta-sts.mail.lumieregardens.com/uploads/1/3/0/4/130488199/vabimivexip_faganupu_tafixid.pdf
    • http://naturestrace.com/uploads/1/3/0/4/130491322/8b0d9f5b070f.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d41.bin
6ab18b1bb3da19af3da2b8f057c230f34885ab47520210d36da95a0e39abebb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D41 9052 bytes

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