Malicious PDF — malware analysis report

Static analysis result for SHA-256 83db84ec4e8b81bc…

MALICIOUS

PDF

37.2 KB Created: 2020-04-07 15:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 999c2a3a13c186c10fc1dba56c4b66e1 SHA-1: 78dfe4fe9c0b115c11ece9f759581e36afc4e97e SHA-256: 83db84ec4e8b81bcb3a0c23a8946811f1dba203e92c6b54e7feca034258a2f4d
92 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF documents. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of such links, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content hosted on these domains. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine a more specific attack pattern beyond the link farm. The primary IOCs are the external URLs identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mcatgent.org/uploads/1/3/0/4/130476601/130476601.html#uncle+johns+band+tab
    • http://poplinstore.com/uploads/1/3/0/2/130287895/poripuposok_zubop_romugexit_kejoliso.pdf
    • http://gigisbakedgoods.com/uploads/1/3/0/7/130776476/zumizavaraju-lejesaxetoweg-fumiwizatu.pdf
    • http://koenen-wein.de/uploads/1/3/0/7/130775111/bewolivurita.pdf
    • http://themarketsharegroup.net/uploads/1/3/0/2/130273776/janugubifolu.pdf
    • http://nhsclipperswalloffame.com/uploads/1/3/1/0/131070198/faxujimosima_dikes_kuxejipaji.pdf
    • http://nuugogo.com/uploads/1/3/1/4/131437626/kafir.pdf
    • http://yourh3meals.com/uploads/1/3/0/3/130379741/9800878.pdf
    • http://anphotography.ca/uploads/1/3/1/0/131071181/repewadikusilidafo.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_off000069e1.bin
cc1b5c7edf711f1d5d3dfcf28759e9cc135eb9f3bc2cdb4e1725bad379b8c6f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E1 7640 bytes

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