Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf31e5645718c4a3…

MALICIOUS

PDF

41.7 KB Created: 2020-03-18 19:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4f8948d926b62436583e66ed8728a282 SHA-1: bdc95110130a9ec14a4142b45cbf0d66dd58ad28 SHA-256: cf31e5645718c4a384995aa5eedd62e40538ceb38d23b47cc99a3cc12cd5a09b
62 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF documents hosted on different domains, suggesting a link farm or SEO poisoning tactic. The document body contains garbled text and metadata, but the primary malicious activity appears to be the distribution of these external links. No scripts were extracted from this sample.

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://helpking.org/uploads/1/3/0/2/130291352/130291352.html#teoria+lev+semionovich+vigotsky
    • http://liliumartisans.com/uploads/1/3/0/6/130603905/5999894ef13f0b.pdf
    • http://preferredagpack.com/uploads/1/3/0/3/130323130/338893354aee0.pdf
    • http://simonssays.net/uploads/1/3/0/2/130288731/zanajo.pdf
    • http://autodiscover.tavernandtap.com/uploads/1/3/0/6/130639647/kixizo_gilemexumonob_pinofikes_vesisepuxirubuz.pdf
    • http://fpmail.forrest-pruzan.com/uploads/1/3/0/6/130621483/tarizikerovemameduv.pdf
    • http://adams-aardvarks.com/uploads/1/3/0/6/130639557/6619925.pdf
    • http://jrdbuildingsurveying.com/uploads/1/3/0/5/130588657/9dae0e1b5561a.pdf
    • http://texstyle.ca/uploads/1/3/0/4/130476378/7328969.pdf
    • http://bearsandtheirs.com/uploads/1/3/0/4/130483631/sagipimezuwod.pdf
    • http://realcurbappealinc.com/uploads/1/3/0/5/130541846/tuzaxuw.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_off000076a3.bin
c620b7a6e7f79c0a58a4b54d3e681de1c2ba46ade085e19f0f51eb63a3b0e56a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A3 9604 bytes

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