Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dc9cfcb13d7b8a…

MALICIOUS

PDF

39.5 KB Created: 2020-04-08 07:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a7237f40a8efadbb2a75f0d1d2709357 SHA-1: 540b427bcf4c6458f955ca7777ca184fd92070f6 SHA-256: b7dc9cfcb13d7b8a4a2baa3fa0510456bc213e111cf2abe91bbc27259eb8e875
92 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 User Execution

The PDF document contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs are likely used to distribute further malicious content or to engage in SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://emblemshares.com/uploads/1/3/1/3/131380992/131380992.html#metodo+grafico+programacion+lineal+pasos
    • http://pblaeh.com/uploads/1/3/0/8/130874490/zapivepugavifit.pdf
    • http://emescapes.com/uploads/1/3/0/7/130776319/zezajexavufevaguf.pdf
    • http://craikpa.net/uploads/1/3/0/6/130639808/zukivemusufuma_benisamapotod_mulelevi.pdf
    • http://ileanalim.com/uploads/1/3/0/4/130490056/4443431.pdf
    • http://ochinlearningforum.net/uploads/1/3/0/8/130814926/70f6185e7.pdf
    • http://kvardek.com/uploads/1/3/0/3/130323209/3629843.pdf
    • http://tshirtmerchpa.com/uploads/1/3/0/6/130604689/6925994.pdf
    • http://nerdsville.org/uploads/1/3/0/4/130489475/01f872abe32f.pdf
    • http://zedplusconsulting.com/uploads/1/3/0/6/130604855/289e664422abe4.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_off00007219.bin
546547c4ded718c53b71a4f436533ed285537a8d006214fab15867130a07c6ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7219 8468 bytes

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