Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cfd21c9820a8cc…

MALICIOUS

PDF

31.3 KB Created: 2020-06-12 09:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3353a9b9b9d168da30281a92935df775 SHA-1: 38c328d04c3e9fcaff2aeca087c7540b3ec95ac0 SHA-256: 93cfd21c9820a8ccee8101eeee5dbf4abdf653b17d8597041de70a903e47d3e5
94 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains a large number of external links, many of which point to suspicious domains. The document body, though partially corrupted, suggests a lure related to an installation manual. The presence of numerous SEO-optimized PDF links on domains like massgraphics16.net indicates a link farm designed to distribute malicious content or facilitate phishing. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF designed for redirection.

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://hostmaster.tilstockbtclub.co.uk/uploads/1/3/0/6/130604279/130604279.html#vesda+laser+focus+installation+manual
    • http://massgraphics16.net/uploads/1/3/0/6/130603771/297665c1e26d.pdf
    • http://mx.floridajeeprides.com/uploads/1/3/0/4/130476034/fanegimanaxat.pdf
    • http://crclabourcouncil.com/uploads/1/3/1/6/131606778/3fd28e.pdf
    • https://pubizebut.files.wordpress.com/2020/06/7898395578.pdf
    • https://taxogagi.files.wordpress.com/2020/06/63011938529.pdf
    • https://lunigizuwuz.files.wordpress.com/2020/06/86902650399.pdf
    • https://niredozunoxe.files.wordpress.com/2020/06/22825000568.pdf
    • https://dosuxotebim.files.wordpress.com/2020/06/50988727126.pdf
    • https://xowagibiwu.files.wordpress.com/2020/06/mowozuxiwaxixuwu.pdf
    • https://gofiteturape494264367.files.wordpress.com/2020/06/xironegixu.pdf
    • https://zafevilak.files.wordpress.com/2020/06/25011014152.pdf
    • https://girepof.files.wordpress.com/2020/06/32540667760.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_off00004f68.bin
0d87bd5db795ea258500343f5684b008e37abd128e4e08ed9d614be5171fe91a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F68 10112 bytes

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