Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b17090e883eb04…

MALICIOUS

PDF

30.1 KB Created: 2020-04-11 08:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a0bb5b8c7982cb99f9196432ef20c751 SHA-1: d794ec20abda43fad6c42f0ad929ca60c9ec20ab SHA-256: a5b17090e883eb04bb84b30748e57e89c2c0b8c671ee471b7dd32cd555b737f8
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links to various domains, many of which appear to be part of a link farm designed for SEO manipulation. The ML classifier strongly indicated maliciousness. The primary purpose appears to be directing users to a network of websites, likely to host further malicious content or for traffic generation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mta-sts.mx.grandsalinelibrary.com/uploads/1/3/0/6/130620572/130620572.html#performance+ford+lincoln+bountiful
    • http://deborahmolsberry.com/uploads/1/3/0/2/130271113/e885dfd2e.pdf
    • http://hottbobs.info/uploads/1/3/0/6/130639609/suvobagika.pdf
    • http://thewritingrocks.com/uploads/1/3/1/4/131437725/27e00e7e0aa4.pdf
    • http://woodyhotels.com/uploads/1/3/0/2/130289340/nirifegazulovas.pdf
    • http://jhrpropertyltd.com/uploads/1/3/0/7/130775403/bizosovejagufugo.pdf
    • http://apexppt.com/uploads/1/3/0/8/130813997/zigivirafun.pdf
    • http://arlinex.com/uploads/1/3/0/5/130588913/9533813.pdf
    • http://fakartstore.net/uploads/1/3/0/6/130621153/garapuminaja.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_off00004edb.bin
3ffb5f2c7da2f0d6ac8712d405e7ceec6590d02351f5511dd62885c49de4ad1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EDB 7616 bytes

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