Malicious PDF — malware analysis report

Static analysis result for SHA-256 913d7b8b98eefe1d…

MALICIOUS

PDF

33.2 KB Created: 2020-04-24 05:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 43fbc1a4adac4602476f3c42d56099dc SHA-1: f738ce6c0981ca13963a652f9da09e49c7adf8fa SHA-256: 913d7b8b98eefe1d0fa3042a8ff7e68e479bc7ab93c6e8126f1eb7ff13648dfe
62 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to seemingly unrelated PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic. The document body is heavily obfuscated and contains a URL that matches one of the identified external links. No scripts were extracted from this sample, limiting the ability to determine further malicious intent.

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://byagathastrati.com/uploads/1/3/1/4/131453136/131453136.html#grading+sheet+for+grade+7+mapeh
    • http://brooksiecooks.com/uploads/1/3/0/6/130604733/denago.pdf
    • http://thescribblespot.com/uploads/1/3/1/0/131070366/texes.pdf
    • http://lagocciacoffee.com/uploads/1/3/0/5/130539129/8518638.pdf
    • http://perthpieco.com/uploads/1/3/1/4/131407051/petuv_kolikaxujuf_gomotix.pdf
    • http://designbyqveen.com/uploads/1/3/1/4/131437411/1763958.pdf
    • http://xodani.shop/uploads/1/3/0/3/130313196/e5836f.pdf
    • http://brooksiecooks.com/upl
    • 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_off00005c29.bin
6e84f876c9b71fb2559246888b5a04bc072ae78f21dab64f09abcc06b24e738e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C29 7412 bytes

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