Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef88ff4ed4d3c73a…

MALICIOUS

PDF

31.6 KB Created: 2020-04-22 13:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 04795bd296b0f36ec41c30153924cb51 SHA-1: 3464accaf33c951c2e0d189cc003a30f42fe68fa SHA-256: ef88ff4ed4d3c73aaa387dc9ba93f0db867622e458206214f580b50aae81a45f
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, contains text related to 'camera preview full screen android' and mentions wkhtmltopdf, suggesting a lure. The ML classifier also flagged the PDF as malicious. The primary attack pattern appears to be directing users to potentially malicious or SEO-poisoned websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 3

  • 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
  • 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://truismmarketing.com/uploads/1/3/0/7/130776147/130776147.html#camera+preview+full+screen+android
    • http://doggyplayday.net/uploads/1/3/0/8/130813961/pusuwen_ziveguvurojuw.pdf
    • http://agropharmacology.com/uploads/1/3/0/5/130539130/vesesi.pdf
    • http://heyguysitsmegabby.com/uploads/1/3/1/6/131607093/0f11de85a9.pdf
    • http://exclaymations.org/uploads/1/3/0/2/130271211/59f224522abe09e.pdf
    • http://stevehawktrumpet.com/uploads/1/3/0/5/130546880/5173488.pdf
    • http://tripstraveltours.net/uploads/1/3/0/9/130969236/8391170.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_off00005353.bin
e4ab2b29dd0b7ccc60acd76e67733741afb0e31f8ddfb3a4044f8b6469fcc128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5353 7980 bytes

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