Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b45dcf08bd0da0f…

MALICIOUS

PDF

54.2 KB Created: 2020-05-30 16:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d00f23217e7d3f17ca032613349f3ed SHA-1: 38b6dda641d04b19f7196737dc7ab60a7955b5e1 SHA-256: 7b45dcf08bd0da0fde6cb17605867469ba6fd836bea98d34f3f2b7a7b1fede39
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by an ML classifier with high confidence. It contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external PDF links strongly suggests a link farm or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://psychoneirology.org/uploads/1/3/0/5/130551298/130551298.html#vygotsky%2527+s+educational+theory+in+cu
    • http://ellenandquinn.com/uploads/1/3/0/7/130738727/vezek.pdf
    • http://jirehconsultinghonduras.com/uploads/1/3/0/7/130738616/8088777.pdf
    • http://myeducationmatters.org/uploads/1/3/1/4/131453010/xiwimapimiteso.pdf
    • http://truck-finance-australia.com.au/uploads/1/3/0/7/130776350/8932823.pdf
    • http://mail.staghornridge.com/uploads/1/3/0/5/130544898/f0c84e4.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_off0000a7db.bin
ed7ec5e0e85a3a4a3b40d884b00fb9f23188c01b8b51233700c5ac7520eeec7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7DB 10640 bytes

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