Malicious PDF — malware analysis report

Static analysis result for SHA-256 6015ad259c59be1d…

MALICIOUS

PDF

35.9 KB Created: 2020-04-28 17:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b65749b9e2d60b0b284d0942f90a724c SHA-1: e611c6451b6d0aa3a340f67bf4ccf4d030cb3e9c SHA-256: 6015ad259c59be1dfd6293de53f05ec3b72bad2ad90840255114b82e349726b2
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as SEO link farms pointing to other PDF documents. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://bluehouseboutique.net/uploads/1/3/0/5/130588708/130588708.html#black+diamond+plate+sheets+4x8
    • http://acevedomedicalconsultants.com/uploads/1/3/0/5/130588718/sosupub.pdf
    • http://mountainrosedeli.com/uploads/1/3/0/8/130815213/bovalejuvu_gapefugem_lifujar.pdf
    • http://thebourboncountrypotteryco.net/uploads/1/3/1/4/131408086/pedumubiv_vixepizi.pdf
    • http://929996840693065924.com/uploads/1/3/0/3/130323211/1623404.pdf
    • http://bloom95.com/uploads/1/3/0/3/130379069/35de4.pdf
    • http://allbundledhair.com/uploads/1/3/0/5/130551670/d691559d6.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_off0000663f.bin
60081a2ea064aa7c507f842d4a6ff8df1a1a82279327b609f6658a5d705e77ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663F 7592 bytes

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