Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ca9a7acf336b04…

MALICIOUS

PDF

39.8 KB Created: 2020-04-17 03:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d0d222fc6cd06477ae663ef9aaf9a67 SHA-1: a0fcc25249ec18478665b5881bbdb839a1d1491a SHA-256: 39ca9a7acf336b04a10c1c4fd2ba88d1f809f2bbd01776bffa6f33b3780b8078
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links, http://surgecloud.org/uploads/1/3/0/4/130489152/130489152.html#emotional+freedom+technique+performance+anxiety, is directly embedded in the document body. This suggests the document's primary purpose is to redirect users to these external sites, likely for malicious purposes such as phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://surgecloud.org/uploads/1/3/0/4/130489152/130489152.html#emotional+freedom+technique+performance+anxiety
    • http://objekt-dekors.ch/uploads/1/3/0/9/130968985/sikijorazigifa-zupuvepipabebi-tujunulofu-tigipilexule.pdf
    • http://interiordesignca.com/uploads/1/3/0/2/130270889/6ee864.pdf
    • http://rgstucco.com/uploads/1/3/0/8/130874318/7760992.pdf
    • http://dongoad.com/uploads/1/3/0/8/130813966/fc4b014a40a99.pdf
    • http://cheekychis.com/uploads/1/3/0/5/130550772/nowidegetedurew-fidinur-tesuralez.pdf
    • http://lightscameracake.com/uploads/1/3/1/1/131164129/8223279.pdf
    • http://caribbeangears.com/uploads/1/3/1/6/131636763/402370717202.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_off0000731a.bin
4c65e358c7d19476ba72f83114f60cf2170b2e69e313a2574796c52c33933574		 pdf-font-stream PDF embedded font (sfnt) at offset 0x731A 8448 bytes

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