Malicious PDF — malware analysis report

Static analysis result for SHA-256 829477adb73cfd84…

MALICIOUS

PDF

38.8 KB Created: 2020-04-03 18:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4818f62bbee5a8bb8e52ffe846d6a04f SHA-1: 4cd3838da45a671bb5588906682966cc49172082 SHA-256: 829477adb73cfd84b5db9b9528d9e64e524f68b89168bb08e12b34864a5989ba
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection tactic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to potentially malicious content hosted on external domains.

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://misssupremepurityqueen.com/uploads/1/3/0/5/130588809/130588809.html#taoizmin+ibadet+yerleri
    • http://avenger24th.com/uploads/1/3/0/5/130539316/7504128.pdf
    • http://arttekk.com/uploads/1/3/0/7/130776850/52341b.pdf
    • http://multinrj.com/uploads/1/3/0/2/130272435/5183128.pdf
    • http://protetik-hannahsjoholm.com/uploads/1/3/0/6/130604036/nozosoji_zuraxaxaxek_nogaza.pdf
    • http://mymistressgertrude.com/uploads/1/3/0/5/130589331/bavewulef.pdf
    • http://goldmindmvmt.com/uploads/1/3/0/8/130814976/jogilamutirobexowibo.pdf
    • http://emmajeanclothing.com/uploads/1/3/0/8/130874305/5887836.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_off00006c9f.bin
4ae9b2e724cf4c69bbf7a6910febbbb4ec2d726af7be4293c1a7f78e03e406fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9F 9420 bytes

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