Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fd9f982601d425…

MALICIOUS

PDF

121.5 KB Created: 2020-05-31 04:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9d6f23a9e31c6071f6cce561b29b86e SHA-1: 7e1dbdcaf040c91fcac56c882a1f17af3062210d SHA-256: e8fd9f982601d425f46bd35620a7661a591417cc3147e57d9836311e5a833811
94 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The document body, though heavily obfuscated, contains text that suggests it is masquerading as a 'software engineering 10th edition pd'. The presence of multiple PDF_SEO_LINK_FARM heuristics indicates a deliberate attempt to create a deceptive online presence. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8315

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://74-123-78-167.mgwnet.com/uploads/1/3/0/9/130969188/130969188.html#software+engineering+10th+edition+pd
    • http://yarnandsparkle.info/uploads/1/3/0/6/130604162/bazeruwufepobenebo.pdf
    • http://danielrudin.com/uploads/1/3/0/7/130774972/5912474.pdf
    • http://axisstrategiesinc.com/uploads/1/3/0/6/130604031/weforebunumuxep.pdf
    • http://dccarescenterinc.com/uploads/1/3/0/8/130814283/6944004.pdf
    • http://emily-briggs.com/uploads/1/3/1/3/131398046/a714dcc9990e400.pdf
    • http://serainaboner.com/uploads/1/3/0/6/130604386/vumotu-visopag-xupupotikixaki-jonesejosivu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018e67.bin
edd339a56ba128a0e1cf3ead5a19d7465539f4a1091a611a7b4c6ee4a73e95de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18E67 2152 bytes
font_01_sfnt_off00019829.bin
268fe175e36224b6dd04a6eab4f52f2a353b3cb18d1392340a66df7ab959e098		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19829 13792 bytes
font_02_sfnt_off0001c445.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C445 16204 bytes

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