Malicious PDF — malware analysis report

Static analysis result for SHA-256 c782888da44e42e1…

MALICIOUS

PDF

36.9 KB Created: 2020-06-20 17:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cebb62b62284dd3cb89f81716f27cf6f SHA-1: 0340e4f40b8410caaa110af3d720a4d35d5188ae SHA-256: c782888da44e42e1e0bd853133039ae2ef9283c63c10e97787837e3891245603
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to various domains, a technique often used for SEO spam or to host malicious content. The document body mentions 'George harrison anthology pdf' and includes URLs that appear to be part of a link farm, suggesting a lure to drive traffic to these sites. The ML classifier strongly flagged this PDF as malicious.

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://craftsbyvb.com/uploads/1/3/1/3/131379741/131379741.html#george+harrison+anthology+pdf
    • http://tittsmcgee.com/uploads/1/3/0/6/130604395/tarorofirev.pdf
    • http://parkcityled.com/uploads/1/3/0/5/130541743/visizusuzurepe.pdf
    • http://luciandgrace.com/uploads/1/3/1/8/131859993/wobemezerozexigari.pdf
    • http://mxst.co.uk/uploads/1/3/0/6/130640128/3152406.pdf
    • http://atelier-tat-ort.de/uploads/1/3/1/4/131453544/178364703ecc87.pdf
    • http://3t3.undesirable.us/uploads/1/3/1/4/131437502/9a0c0f04e.pdf
    • http://jecliban.com/uploads/1/3/0/8/130814597/9e34e.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_off000051dc.bin
2e0e65617abb044b29c5081bfd5468b06d0f6b4e2726f2afabc9f0dff780750c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51DC 5224 bytes
font_01_sfnt_off000063a7.bin
0bd5102beaa13266f7be7660d89488b6f67b071a7473489b68d07f80d009537d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A7 10480 bytes

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