Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b04a95bb0b1d726…

MALICIOUS

PDF

36.3 KB Created: 2020-06-04 21:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b00f39ffb04f6cece33c3fcb75b0f436 SHA-1: 9dc5a53b8ff360d82264677e3cac9d3c2cdef7dc SHA-256: 6b04a95bb0b1d726df7a27fc3043d565ac26ab5ae7ef969b7ebb08171bde0b59
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings suggest an attempt to redirect users to potentially malicious content or for SEO manipulation.

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://chisaicritters.com/uploads/1/3/0/7/130739250/130739250.html#six+forces%252C+each+of+magnitude+either+f+or+2f%252C+are+applied+to+a+door+as+seen+from+above+in+the
    • http://expertmind.org/uploads/1/3/0/9/130969279/ziwimekame-timepafajo-bokopedawiwod.pdf
    • http://qipaiyouxizenmezhuanqian.br3h.com/uploads/1/3/1/4/131406440/cca82f0.pdf
    • http://claytonmorrisassociates.com/uploads/1/3/0/9/130969727/migajinex-nupofut-novetowijuxe-xutuka.pdf
    • http://caideptoluca.com/uploads/1/3/0/6/130604332/vepitimitegakomuguxa.pdf
    • http://liznash.com/uploads/1/3/1/4/131454238/87616671e.pdf
    • http://westlacondos.com/uploads/1/3/0/2/130272424/1621838.pdf
    • http://autodiscover.whiterivercoffee.com/uploads/1/3/1/4/131410399/guvuvazere-tidapibudu-xukojodebewivuw.pdf
    • http://jenreidphotoart.com/uploads/1/3/0/6/130605075/4898735e17370fc.pdf
    • http://active-ned.com/uploads/1/3/0/5/130551257/2c771c7a3a21.pdf
    • http://lesindispensables.net/uploads/1/3/0/7/130776626/2161057.pdf
    • http://mobi.revisia.de/uploads/1/3/0/7/130775195/bosiwutawalab-sinorut-winob.pdf
    • http://goforjesse.com/uploads/1/3/0/2/130288565/dasixagov-xilukener-fisuvaperu-kokopekowumota.pdf
    • http://chisaicritters.com/uploads/1/3/0/7/130739250/terms.html
    • http://chisaicritters.com/uploads/1/3/0/7/130739250/dmca.html
    • http://chisaicritters.com/uploads/1/3/0/7/130739250/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://karozaga.files.wordpress.com/2020/06/79015040455.pdf
    • https://piviraxiwak.files.wordpress.com/2020/06/tofisuzajekejaz.pdf
    • https://mabozewunes.files.wordpress.com/2020/06/lusifuzuregabofapekuxuwit.pdf
    • https://subezokebiw.files.wordpress.com/2020/06/xaxitujelawegifimidonozo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060e9.bin
284cef16741e48f2ec8f8d7085d31161157ccfdb6096bec4aa0a778364ab3fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x60E9 10328 bytes