Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf470a759ba09666…

MALICIOUS

PDF

39.8 KB Created: 2020-06-21 12:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1543b227f24ce742528d1b192b57748 SHA-1: 8c3de1dd631b258070e607541d81cabd4f2cb60e SHA-256: bf470a759ba09666ac205603e8744298b0bf401ef593f6de7a1a70f3daa18503
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. The document body itself is largely unreadable binary data, but the presence of the URL http://empireofdata.com/uploads/1/3/1/4/131437423/131437423.html#sindrome+de+rokitansky+pdf suggests a potential lure.

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://empireofdata.com/uploads/1/3/1/4/131437423/131437423.html#sindrome+de+rokitansky+pdf
    • http://kimschofield.net/uploads/1/3/1/6/131606947/e23f1e67785d7.pdf
    • http://webmail.fissurecharlevoix.com/uploads/1/3/0/6/130603683/zutagenuvi-bizexu.pdf
    • http://foodravin.com/uploads/1/3/0/6/130621702/3944961.pdf
    • http://2nb.undesirable.us/uploads/1/3/0/6/130620163/24d3b7.pdf
    • http://physioflexsf.com/uploads/1/3/0/7/130738797/5909720.pdf
    • http://nuwarudev.com/uploads/1/3/0/8/130814174/kajikefepewu-mitovo.pdf
    • http://admin.sewcherie.com/uploads/1/3/0/6/130603725/pukagemurimu.pdf
    • http://mta-sts.mail.pcclub.ch/uploads/1/3/0/3/130313414/fopaxavamifonagax.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b8b.bin
7bcbf542f8c6f4df7a44baaee71e54832ed8a1d32ee3f2de90c93c36f2a4909e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8B 5212 bytes
font_01_sfnt_off00006d24.bin
c700f53725bf79c50aaab6125e7f5c391f474cb9441c705a6f176c9120d79cf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D24 11168 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.