Malicious PDF — malware analysis report

Static analysis result for SHA-256 a727bece8df24f21…

MALICIOUS

PDF

31.9 KB Created: 2020-04-13 14:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c297cf77d89c53fdc2e73748942ca09b SHA-1: 35f5dd65bee9e303be379599a7ff6fde4977d4f2 SHA-256: a727bece8df24f21e20d73f5255e4c3d9f23f5f2fc9d0f33a69859dc36388254
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. No scripts were extracted, but the sheer volume of suspicious URLs suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://agpmav.com/uploads/1/3/0/6/130603889/130603889.html#difference+between+t+test+anova+and+chi+square
    • http://tryonsquare.com/uploads/1/3/0/6/130603946/xejad.pdf
    • http://davidfancy.com/uploads/1/3/0/2/130273735/c32abdd7e758f1.pdf
    • http://zoukuniverse.com/uploads/1/3/0/6/130604699/7480780.pdf
    • http://bubblewafflebaku.com/uploads/1/3/0/9/130969960/bobabi.pdf
    • http://conectads.org/uploads/1/3/0/2/130272606/foguregur-xesutaduxexo-natisilo-minezerolonob.pdf
    • http://onestopmanagement.net/uploads/1/3/0/8/130814127/8d277282f17.pdf
    • http://daivernonfoundation.com/uploads/1/3/0/4/130491008/pagurev.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_off000058ae.bin
6747bbb82dc5a330dc0ed6a5ae8e56440c310b66f35e3cc8dffff9e2dd81fb74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58AE 6776 bytes

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