Malicious PDF — malware analysis report

Static analysis result for SHA-256 885e7794497bd28b…

MALICIOUS

PDF

55.3 KB Created: 2020-04-12 22:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ab79025d0a2206adaad05b50f4d16acd SHA-1: 4bc676916a224a8a7c951dfbd6be963599f4e486 SHA-256: 885e7794497bd28bb1f45b0510f7b39eb829180c2d88d76def6cae867aeace25
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. The ML classifier also flagged this PDF as malicious. The document body contains obfuscated text and embedded URLs, suggesting an attempt to disguise the malicious nature of the links. The primary function appears to be directing users to external resources, likely for malicious purposes such as malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://rbhflooring.com/uploads/1/3/0/7/130740056/130740056.html#un+viejo+amor+autor
    • http://analitix.org/uploads/1/3/1/1/131164218/08e42c3fc143.pdf
    • http://thetruth4me.com/uploads/1/3/1/4/131406505/zekodekuvalomal.pdf
    • http://moving-is-easy.com/uploads/1/3/1/3/131384696/f649945bdecd6e.pdf
    • http://braedanritter.com/uploads/1/3/0/6/130604700/keduguz_xowoziviruraf.pdf
    • http://burningramen.com/uploads/1/3/0/5/130543240/tewaboriwiwago-zosub-bibigivumegafig-desazikirufi.pdf
    • http://tadpoledryerase.com/uploads/1/3/0/6/130639835/bovubad.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_off00009845.bin
9713f1ca9418ba292d3084c3d6ebfaa585c844367ce6cc3a50e72a960606d771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9845 9692 bytes
font_01_sfnt_off0000bb0c.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0C 16036 bytes

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