Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c5602fab653199…

MALICIOUS

PDF

49.4 KB Created: 2020-06-18 11:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d644bd644251021c7982394df24cc6a3 SHA-1: aa5722f5acd41c66ecdae21b5c2c8cb0a1728723 SHA-256: b6c5602fab6531998156c8eb00e009ee95dfb5563eb18837b127433d7657fa50
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs are likely used to distribute further malicious content or to engage in SEO spam tactics. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cpanel.g12generation.com/uploads/1/3/0/7/130776763/130776763.html#organigrama+onu+pdf
    • http://hostmaster.sareetadomingo.com/uploads/1/3/0/7/130776266/5d0d72bbc371.pdf
    • http://mataesque.com/uploads/1/3/0/5/130545581/diresave.pdf
    • http://tandb.net/uploads/1/3/0/5/130588856/tajasabuwosomav.pdf
    • http://uberdrivertraining.com/uploads/1/3/1/0/131071184/dazonosuzubawedofaf.pdf
    • http://gadget.elikaro.eu/uploads/1/3/0/4/130489346/0de7a28b.pdf
    • http://dmdesignservices.com/uploads/1/3/0/6/130604515/jabupovudalug.pdf
    • http://peopleofthestreets.net/uploads/1/3/0/2/130272573/lesubepefakunexo.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_off000084aa.bin
1342adae1a6865df27a110bdd92b1e7ad728ad6277e96e2353ef205344ee7673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84AA 4864 bytes
font_01_sfnt_off0000950a.bin
74775c574fbbe8c7e73150ed7f6e35c2a12700d93c57278ee6009bb08ec6aecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x950A 11356 bytes

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