Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8fa34371540234…

MALICIOUS

PDF

37.1 KB Created: 2020-04-12 05:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b5bc07daf9b25538e34bac590ec7eab3 SHA-1: 27808123dd45b0487823f021c657240664a670cc SHA-256: 8f8fa34371540234784b13dcd0377190b337140a952e520280a575983149a319
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, a technique often used for SEO link farms or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body contains text related to 'Palabras que terminen en penia' and mentions wkhtmltopdf, suggesting it might be a generated document. The primary attack pattern involves directing users to a network of similarly structured URLs, likely to host further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://eightdaysmediatest.site/uploads/1/3/1/4/131453221/131453221.html#palabras+que+terminen+en+penia
    • http://worldheartsfairtrade.net/uploads/1/3/0/5/130551191/f1c21.pdf
    • http://biglakefishboil.com/uploads/1/3/0/5/130544132/db4d9c5.pdf
    • http://worldtalented.com/uploads/1/3/1/3/131398285/934540.pdf
    • http://thequailsnest.com/uploads/1/3/0/7/130739333/wasutovefexo_gulabe.pdf
    • http://beautifulneuralnetworks.com/uploads/1/3/0/6/130604862/56bbbaadf4c2.pdf
    • http://myrole.consulting/uploads/1/3/0/2/130289561/4d51acd26c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bbe.bin
977a2b37818f03ee19a70a00f72cb09a2e4778b442738ab94ba3c7a5d5e6180c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBE 9348 bytes
font_01_sfnt_off00007d5a.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5A 2652 bytes

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