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) First seen: 2020-09-24
MD5: d1543b227f24ce742528d1b192b57748 SHA-1: 8c3de1dd631b258070e607541d81cabd4f2cb60e SHA-256: bf470a759ba09666ac205603e8744298b0bf401ef593f6de7a1a70f3daa18503
96 Risk Score

Malware Insights

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

This PDF document is designed to act as a link farm, directing users to numerous external websites. The document body contains obfuscated text and a URL that appears to be part of a SEO spam campaign. The presence of multiple external links, many with numeric slugs, strongly suggests an attempt to drive traffic to malicious or low-quality content, likely for phishing or malware distribution.

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 PDF link annotation
    • http://kimschofield.net/uploads/1/3/1/6/131606947/e23f1e67785d7.pdfIn PDF document text
    • http://webmail.fissurecharlevoix.com/uploads/1/3/0/6/130603683/zutagenuvi-bizexu.pdfIn PDF document text
    • http://foodravin.com/uploads/1/3/0/6/130621702/3944961.pdfIn PDF document text
    • http://2nb.undesirable.us/uploads/1/3/0/6/130620163/24d3b7.pdfIn PDF document text
    • http://physioflexsf.com/uploads/1/3/0/7/130738797/5909720.pdfIn PDF document text
    • http://nuwarudev.com/uploads/1/3/0/8/130814174/kajikefepewu-mitovo.pdfIn PDF document text
    • http://admin.sewcherie.com/uploads/1/3/0/6/130603725/pukagemurimu.pdfIn PDF document text
    • http://mta-sts.mail.pcclub.ch/uploads/1/3/0/3/130313414/fopaxavamifonagax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8B 5212 bytes
SHA-256: 7bcbf542f8c6f4df7a44baaee71e54832ed8a1d32ee3f2de90c93c36f2a4909e
font_01_sfnt_off00006d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D24 11168 bytes
SHA-256: c700f53725bf79c50aaab6125e7f5c391f474cb9441c705a6f176c9120d79cf8