Malicious PDF — malware analysis report

Static analysis result for SHA-256 f937c4659fbba1d7…

MALICIOUS

PDF

48.7 KB Created: 2020-04-16 23:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d691df7b90f17ced53f90329236a450c SHA-1: 292e4d8e20ac0bbfe3d8302da3d123c07e24f165 SHA-256: f937c4659fbba1d7ffe7ad5832dc5143ddf28f05e01e0dc7b37d88ad99bc5445
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text is heavily obfuscated but contains references to URLs, suggesting a lure to external content. The primary attack pattern appears to be a link farm designed to direct users to potentially malicious websites.

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://kmipropertieslimited.com/uploads/1/3/0/8/130814874/130814874.html#av+player+application
    • http://michaelmchalffey.com/uploads/1/3/0/5/130588168/jomojusikepugebu.pdf
    • http://noufamood.com/uploads/1/3/0/4/130483728/jexizugafut-ruxemavi.pdf
    • http://centralmooloolah.com/uploads/1/3/0/7/130776245/gosazalena.pdf
    • http://pawlover.com/uploads/1/3/0/3/130379363/c3b1b655e8.pdf
    • http://parentingpaws.com/uploads/1/3/1/0/131070237/67ddb837f79edf.pdf
    • http://mycryptopath.com/uploads/1/3/0/2/130271229/kivizit_delodanovutite_somegab.pdf
    • http://chiroworksinfo.net/uploads/1/3/1/4/131406709/vesubiwawavijuwo.pdf
    • http://imperioemprendedores.com/uploads/1/3/0/5/130551019/27a914.pdf
    • http://logchurchnewhaven.com/uploads/1/3/0/9/130969728/6515759.pdf
    • http://parentingpaws.com/uploads/1/3/1/0/131070237/67ddb837f79edf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008978.bin
2412dd40f51244272147abd5ec64370fe93e92241b0c464337f754c29e2c65ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8978 8944 bytes
font_01_sfnt_off0000ab8d.bin
43949651a11e0141dfc60eb3714369aad5813d84d94f08b8286061d056c68bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB8D 4192 bytes

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