Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69037b6eabb58fa…

MALICIOUS

PDF

35.3 KB Created: 2020-04-13 12:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e552166aeff9c1893f7d04b52a16e125 SHA-1: 14601531f9173d673014bf212d86fe15bff32f66 SHA-256: f69037b6eabb58faf00b26673c20132924f2b924070396bfdc26722c78ebe8a9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that is also present in the list of extracted URLs, suggesting a deliberate attempt to direct the user to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://jonbjorgaard.com/uploads/1/3/1/3/131379320/131379320.html#money+origami+owl+folding+instructions
    • http://jesseyoga.com/uploads/1/3/0/3/130312916/8576903.pdf
    • http://projecteagleatl.com/uploads/1/3/0/5/130551331/a34e36353f.pdf
    • http://fund-page.com/uploads/1/3/0/5/130590261/2030725.pdf
    • http://100phrases2freedom.com/uploads/1/3/1/0/131069910/zezifojuxarelomekix.pdf
    • http://ginger-snaps.ca/uploads/1/3/0/7/130776260/1a862d0e9cfc.pdf
    • http://allthingslilyanna.com/uploads/1/3/1/4/131483265/xawinamabuvutuzog.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_off00006388.bin
4262acefa59b67cfab77dffce587ede92804d65befd610dcdc863c5de0af28b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6388 7688 bytes

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