Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5fd3776cb66633…

MALICIOUS

PDF

32.3 KB Created: 2020-05-15 22:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e68d272bdb38f2d2adfaf8665bc0d928 SHA-1: d5ad4dba3f5295dd7e7660435ce1abf5067f6e17 SHA-256: 8e5fd3776cb6663311226ab129496f9d2daadbbb32555b0d81d2386c82895305
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains URLs that are consistent with the link farm heuristic. The primary attack pattern appears to be directing users to a large number of external resources, likely for malicious SEO or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://tiffinindia.ca/uploads/1/3/0/8/130814976/130814976.html#canon+in+d+chords+sheet+music
    • http://aocolum.se/uploads/1/3/0/7/130738566/jugomem.pdf
    • http://janibotanicals.com/uploads/1/3/1/8/131856257/1c066902.pdf
    • http://gotothaveitboutique.com/uploads/1/3/0/4/130435509/a092b623992368.pdf
    • http://campbell-france.com/uploads/1/3/0/6/130620627/4679721.pdf
    • http://mskenny.com/uploads/1/3/1/3/131384599/10364daaca.pdf
    • http://personalizedengravedcuttingboards.com/uploads/1/3/0/6/130639678/pexozoradofivif.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_off00004f64.bin
327a33234813dca6767b2f6aaf24c1548e64bdb151f7502abf937b75e31b86f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F64 11720 bytes

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