Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0eb620bc2c4bbc…

MALICIOUS

PDF

35.4 KB Created: 2020-05-16 00:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84f68031bb8e767e89e2e54e8fdb9fa2 SHA-1: 3e9edd5334193d9a4e62cb335791911d7e7a9619 SHA-256: 6d0eb620bc2c4bbc03622457742335218c474259683125271d65ca057e08ea81
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 PDF files and HTML pages. The ML_NYX_PDF_MALICIOUS classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the URLs, suggesting a link farm or redirection mechanism to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://creditbossbonus.com/uploads/1/3/0/8/130814007/130814007.html#hbase+vs+cassandra+performance
    • http://themarquillaproject.org/uploads/1/3/1/4/131437130/2289071.pdf
    • http://hearttohealthwellness.net/uploads/1/3/0/5/130551994/fikinib_favozebudupiz_soseruleropuxaf_fewerurekati.pdf
    • http://mahoganycoyhair.com/uploads/1/3/0/3/130323596/newevedek.pdf
    • http://vibramhk100.com/uploads/1/3/1/4/131407292/xojatixavipanekuja.pdf
    • http://soccerlegion.com/uploads/1/3/1/8/131856109/nonetevoxanap.pdf
    • http://sjmyardcreations.com/uploads/1/3/1/8/131856050/tulewegev.pdf
    • http://atlanta-treeservice.com/uploads/1/3/0/5/130551366/268839.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f2e.bin
9d027f2099cc7546f194af18ea8974fb5c90e03f9277154c73c575a8f41112af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2E 10500 bytes

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