Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dc8c383013e8b6…

MALICIOUS

PDF

76.9 KB Created: 2020-04-12 09:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: adf728380d586b0431f97a87c12ae72d SHA-1: 5e3daa5798aa5f3daead98df926effbfb43f5499 SHA-256: b8dc8c383013e8b61d5101d993870c41fc1c58dfc0e1ef0a021f34499d80b144
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. This technique, known as a link farm, is often used to manipulate search engine results or to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body contained obfuscated text and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://westportdumpsters.com/uploads/1/3/0/7/130738696/130738696.html#poema+de+romanticismo+corto+con+autor
    • http://archaeologicallithics.com/uploads/1/3/0/4/130488295/340e2d.pdf
    • http://elitehomesbybibi.com/uploads/1/3/0/2/130272902/31e68cfab.pdf
    • http://thefunbubbleguy.com/uploads/1/3/1/3/131398431/govasesegolowi.pdf
    • http://davidsbridalnh.com/uploads/1/3/0/9/130969990/2991169.pdf
    • http://ima-jordan.com/uploads/1/3/0/8/130874139/gosipazajiriwu.pdf
    • http://perfectcandidates.com/uploads/1/3/0/6/130604543/gawas.pdf
    • http://mycslab.com/uploads/1/3/0/7/130739686/gasokisekunukopanuba.pdf
    • http://hawaiiislandtents.com/uploads/1/3/0/5/130545627/lasutapizepi_jubitoxek_jenedusipejebow.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_off00010306.bin
fbf40b1f846ffde1aa8229489033a5a23333886e1970ba27b9fc2bffd5b116d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 9644 bytes

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