Malicious PDF — malware analysis report

Static analysis result for SHA-256 7844a5d43e64d051…

MALICIOUS

PDF

45.7 KB Created: 2020-04-11 01:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 13bc28d23a1c5fdaf596cb2fc52c8469 SHA-1: c23eb9fdd8cf9b2d06299165386216fbe9b05cfd SHA-256: 7844a5d43e64d0514ed06d0f4bc07487f9bf5218eb9724338aa80dd8f4775731
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which point to other PDF files hosted on suspicious domains. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to distribute further malicious content. The embedded text 'As a man thinketh download pdf' is likely a lure to encourage downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://74-123-77-221.mgwnet.com/uploads/1/3/0/5/130588982/130588982.html#as+a+man+thinketh+download+pdf
    • http://6tyg6uyfjiutkuyghg-iugjh.xyz/uploads/1/3/0/4/130476294/luwimagavaviz.pdf
    • http://coursdeviolonmb.com/uploads/1/3/1/4/131413418/6b1636c8693.pdf
    • http://herbalmedicinevictoria.com/uploads/1/3/0/5/130551630/pasabuji-zenuvubi-jawolo-tafivojekirebo.pdf
    • http://doortodoorspore.com/uploads/1/3/0/4/130476396/vovew.pdf
    • http://lakeyshamattis.com/uploads/1/3/0/7/130776740/4c371d1ef4a7.pdf
    • http://doctorumbriaco.com/uploads/1/3/0/2/130287882/9159638.pdf
    • http://levelonesafety.com/uploads/1/3/0/4/130483583/kofudo.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_off00008b39.bin
1b79a8fc7b4949b1a82bada8173b1d48bcc7017619c0ae5b59959f1a424c9ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B39 7764 bytes

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