Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7053a27a0935fa…

MALICIOUS

PDF

39.2 KB Created: 2020-04-05 08:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a3c14b8241958dd91ea30c0725e08416 SHA-1: 7a3c079f5df9569c0db5e161c05f2003c0519a08 SHA-256: 5b7053a27a0935fa7e1230b7f7653c5822af8acbbeea46f6283d30f899c368cd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially obfuscated, includes a URL that appears to be a lure for a tutorial on calculating square roots. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm or redirection scheme designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://division4llc.com/uploads/1/3/0/5/130588590/130588590.html#como+sacar+la+raiz+cuadrada+de+2704
    • http://tiffanymaryferguson.com/uploads/1/3/0/5/130539940/235245.pdf
    • http://shirtsadk.com/uploads/1/3/0/2/130273982/vomenizixab.pdf
    • http://www.ehlersdanlosaustralia.com/uploads/1/3/0/7/130776646/2a2ede6701.pdf
    • http://rosenhaupt.com/uploads/1/3/0/7/130738576/49a6807f6f0a.pdf
    • http://seastar.websalve.com/uploads/1/3/0/6/130620773/2816975.pdf
    • http://nestedphoto.com/uploads/1/3/0/2/130271161/josakabanawazozubaju.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_off00006d96.bin
39e714cd1dd2f0c1377f01836aafddbf0d979641f87f5bbd269a000f38d051f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D96 9080 bytes

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