Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd112d9381bc752…

MALICIOUS

PDF

37.8 KB Created: 2020-04-06 13:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 035d998343fb041d566f6279a77eba54 SHA-1: f5479c11e094cb50fe15ccd1f2f1ecf783eaaeff SHA-256: cfd112d9381bc752f6bcb798884f6a224fa32ad7a64d098fee9538873bbcdfe7
92 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The 'PDF_SEO_LINK_FARM' heuristic specifically flags this behavior, indicating a large number of external links generated for SEO purposes. The ML classifier also strongly indicates maliciousness. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is driven by the embedded URLs.

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://laymentality.org/uploads/1/3/0/8/130813945/130813945.html#tecnico+en+atencion+prehospitalaria+sena+medellin
    • http://counterpointservices.org/uploads/1/3/1/3/131383820/2794865.pdf
    • http://doloresheightsmodern.com/uploads/1/3/1/3/131379856/velapubanatawazipuvo.pdf
    • http://frhallfabrications.com/uploads/1/3/0/3/130323390/purunadiwudi-dubizobikujonip-mugaxiwum.pdf
    • http://christinaduvarney.com/uploads/1/3/0/7/130776147/tekal_murodorijadu_lixiko.pdf
    • http://silkeglobal.com/uploads/1/3/0/2/130289354/5781992.pdf
    • http://riverbendbaptist.net/uploads/1/3/1/0/131071288/5096581.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_off00006712.bin
637d2f2d8c973b3ae49962bc89e518ff6254c0ff88c10cca2d8045190d7c0b3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6712 9292 bytes

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