Malicious PDF — malware analysis report

Static analysis result for SHA-256 06449168844eb3c7…

MALICIOUS

PDF

38.9 KB Created: 2020-04-05 08:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 34a0b85ea11057f79aa4d0faee48bea0 SHA-1: f6bc7347db3153b8576ad1eab06cf2ec3bfe967f SHA-256: 06449168844eb3c788289877f0784a54c595a80ef635dbbaf116b0ae98ddcf1e
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, a technique often used for SEO manipulation or to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, but the document body contains URLs that are likely part of the link farm.

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://jadeandgreyacc.com/uploads/1/3/1/3/131380944/131380944.html#diferencias+estructurales+entre+mioglobina+y+hemoglobina
    • http://waksvik.com/uploads/1/3/0/6/130621061/fd788177b20022.pdf
    • http://tipforacure.com/uploads/1/3/1/4/131437695/1039238.pdf
    • http://taipannaturals.com/uploads/1/3/0/3/130379096/2805194.pdf
    • http://freehotyoga.com/uploads/1/3/0/8/130814024/4571404.pdf
    • http://orange-spotlight.com/uploads/1/3/0/4/130436196/rolivujosaluf.pdf
    • http://matthewjacobi.com/uploads/1/3/0/9/130969259/lamevorofodegi_funate_kaxitar.pdf
    • http://flyinamerica.com/uploads/1/3/0/5/130588710/5980855.pdf
    • http://cachetcases.com/uploads/1/3/0/2/130288563/gosekojebovofeta.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_off00006c57.bin
5ace77d061b41e4f6b064c2aac7bb03c9db8e494cd5c8f7751643b3d2d2db453		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C57 8932 bytes

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