Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02b928e87f7cac7…

MALICIOUS

PDF

36.1 KB Created: 2020-04-06 02:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3a27691b09deee30edbfe581eb767f83 SHA-1: 8427c5d3ef77c980f20e5e1b8c23c332e07763f8 SHA-256: f02b928e87f7cac70c6236b39332a30f36e65d9e0dcb5e3959999bf17e920b73
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or a method to distribute malicious content across multiple sites. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jamiecobbrealty.com/uploads/1/3/0/2/130272352/130272352.html#5+palabras+con+blin
    • http://gathering-grounds.com/uploads/1/3/0/8/130874305/timesed_faravu_siwagunusew.pdf
    • http://wssdcsa.com/uploads/1/3/0/8/130873787/af428392a2b.pdf
    • http://inspiredtrailcoaching.com/uploads/1/3/0/6/130621798/fovewigigegoj.pdf
    • http://thegaragespringkings.com/uploads/1/3/0/5/130551021/nisuvolokijuwolo.pdf
    • http://learntechinc.com/uploads/1/3/0/5/130551054/ditosowubox.pdf
    • http://worldviewschoolofherbalarts.com/uploads/1/3/0/7/130775144/715890.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_off00006414.bin
50831a536725b4f998c9110d091d56e645163c2f49bc589026a3a886a1a88a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6414 8476 bytes

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