Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd587f42e019f3f…

MALICIOUS

PDF

38.3 KB Created: 2020-06-17 04:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9a61b26002b50286725e92e434aea3a SHA-1: 32c0a636c7790a131570fc9b5607d4aebb817c1d SHA-256: 9fd587f42e019f3f9ce50e0f1ef4a020515c37380ed239b95e5f0701ff0e0092
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body text, though partially corrupted, includes a URL that is also present in the list of external links. This suggests a link farm or redirection strategy designed to lead users to malicious content. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://buffalomessenger.com/uploads/1/3/1/4/131406835/131406835.html#causes+and+effects+of+malnutrition+pdf
    • http://mc4.tech/uploads/1/3/0/2/130289428/gabisojif.pdf
    • http://homeessence.info/uploads/1/3/1/4/131437880/kopawezalumevupejako.pdf
    • http://thespanishsojourner.com/uploads/1/3/0/7/130775192/7104686.pdf
    • http://standrewsanglican.net/uploads/1/3/0/7/130775063/1881506.pdf
    • http://lenorazieglers.org/uploads/1/3/0/5/130545396/jumivupojidubil-betisevasotaki.pdf
    • http://themedicalscienceeditor.net/uploads/1/3/0/7/130738720/xutulilomodojirazij.pdf
    • http://shanghai.amarahotels-zh.devsite-1.com/uploads/1/3/0/6/130620929/1244085.pdf
    • http://unbarbadosandoecs.org/uploads/1/3/0/5/130589099/zarized.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b89.bin
2614fcea03d92aca0b601de76a352e53be7205cd3d315bd1d6e3b51f44c95bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B89 5208 bytes
font_01_sfnt_off00006d1e.bin
ddbefb985ddeccaee2ad0f4cd39513acce20019401264ca78c938f76e042914c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1E 9440 bytes

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