Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d2a8c22b423502…

MALICIOUS

PDF

39.4 KB Created: 2020-04-03 08:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ad7cd1cc845990f36c93ab19dabb5fb2 SHA-1: f32982908d9d114717d7a2cee7f9ae6d93600308 SHA-256: f1d2a8c22b423502a9902cc98bf2556348a8bdc7402e24e4bd24172b1bf0a68d
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution network. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The document body is heavily obfuscated and appears to contain fragments of the URLs, reinforcing the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://forindianola.com/uploads/1/3/1/4/131413678/131413678.html#5e+long+rest+rules
    • http://omnispeak.org/uploads/1/3/0/4/130476804/6286936.pdf
    • http://curbsided.com/uploads/1/3/1/4/131438257/8599017.pdf
    • http://archmage-legacy.com/uploads/1/3/0/9/130969384/firetuwojarowaju.pdf
    • http://dporfebre.com/uploads/1/3/0/6/130604649/mudujafanafub_nifalobixeto_runewelunu_wudozuziji.pdf
    • http://newbirthdoula.ca/uploads/1/3/0/7/130739113/92c1a45fe.pdf
    • http://tylerwarerei.com/uploads/1/3/0/7/130739624/4395609.pdf
    • http://whenindoubtwalkthedogs.com/uploads/1/3/0/6/130604108/602a13.pdf
    • http://stemhistorysa.com/uploads/1/3/0/7/130775731/1caaa14.pdf
    • http://hopkinshealthcarerx.com/uploads/1/3/0/6/130621361/9592181.pdf
    • http://mirembegirlsvocationalcentre.com/uploads/1/3/0/7/130775515/pujedupitamu.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_off00006718.bin
a8157261ac7883652e0fd1c717f248fa39e4702b878d79003f41ed8458e84b2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6718 8376 bytes
font_01_sfnt_off00008765.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8765 2652 bytes

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