Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d3d804a8f7c4ef…

MALICIOUS

PDF

40.0 KB Created: 2020-05-20 22:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c13c216901ba6d1fa7bf770261f640f0 SHA-1: aee1f67af6efc9e6ec33d9e124839d91043e5af3 SHA-256: 11d3d804a8f7c4ef3c80e43cec11ce89f016330c7773f000ff41ec2b77bd6098
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests a potential for hosting malicious content or redirecting users to phishing sites. The document body itself is heavily obfuscated and contains some of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://privacy-update.com/uploads/1/3/1/3/131398479/131398479.html#deixam+poligamia+sims+4+mccc
    • http://laracriminallaw.com/uploads/1/3/0/4/130491703/belejib-tubapuloser.pdf
    • http://adnpkids-researchfoundation.org/uploads/1/3/0/4/130489240/gufimolileke.pdf
    • http://madisongahaferart.org/uploads/1/3/0/6/130605388/020ca616a557a.pdf
    • http://1gospelofgod.com/uploads/1/3/1/4/131408224/2769040.pdf
    • http://wemaintainhomes.com/uploads/1/3/0/8/130874169/1523a5a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069a2.bin
5d5a666d7810b26816f99930c75e386489b90f7c6ba2735053b06d99133c8b8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A2 14224 bytes

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