Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9db9fd87767762e…

MALICIOUS

PDF

62.2 KB Created: 2020-05-29 21:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77ebd248aec66e99013449111e073b4e SHA-1: 3c7ce376f61824b7a8cf6561ea8502ef72606748 SHA-256: c9db9fd87767762ec808dacce7c03fc1b36387e13ad586f610c6c875d12d0887
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, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The embedded document body text is largely unreadable due to encoding issues but contains fragments of text and metadata indicating it was generated by wkhtmltopdf. No scripts were extracted from this sample. The primary attack pattern appears to be the distribution of links to potentially malicious content.

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://achildrensbookcorner.com/uploads/1/3/0/6/130620668/130620668.html#porovnajte+starovek%25C3%25A9+Gr%25C3%25A9cko+a+starov
    • http://chrysalisyouththeater.org/uploads/1/3/0/6/130605390/kijirasu_zirafimame.pdf
    • http://pentak.org/uploads/1/3/0/9/130968912/sibizetulikat.pdf
    • http://thedecorativedog.com/uploads/1/3/0/5/130539338/rufularafuniza-tiferobuselom.pdf
    • http://alexascleaningservices.org/uploads/1/3/0/5/130543536/a71a46aedd.pdf
    • http://pinnb.slpny.com/uploads/1/3/0/7/130775782/38b0da.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_off0000bf90.bin
65bd842b625c497e83da211d5bb4907d053107cd802e57a3531fdf768af927e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF90 15208 bytes

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