Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e2980094248fa9…

MALICIOUS

PDF

36.6 KB Created: 2020-04-06 04:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 015de5c108de32665fb1a4c84650997b SHA-1: 88072e6998406080b34e72131035773410edff4e SHA-256: a4e2980094248fa9dfd91846989e563904d67c51dc9569f50b7e938595caf3b6
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, many of which appear to be generated for SEO purposes or to host malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass external PDF link farm. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://schmudenursing.com/uploads/1/3/0/6/130605331/130605331.html#frigidaire+oven+error+codes+f10
    • http://teufelsleiter.com/uploads/1/3/1/1/131164121/nifemu_kilexizit.pdf
    • http://eleftheriadoukallia.com/uploads/1/3/0/5/130551457/1aabda8def8d.pdf
    • http://leaderfulpowership.com/uploads/1/3/0/5/130543053/dofokolub_nobopawasi.pdf
    • http://bankedroots.com/uploads/1/3/0/6/130605447/6834919.pdf
    • http://petportraitsbymelonee.com/uploads/1/3/0/8/130814065/mumulonup.pdf
    • http://moveupwithus.net/uploads/1/3/0/6/130621218/ef01078b406.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_off00006773.bin
48c9824aec3f1a73d4fa39e9f24c99b30e83adabb585c960e548aea946550232		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6773 7480 bytes

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