Malicious PDF — malware analysis report

Static analysis result for SHA-256 595850045e9df7fe…

MALICIOUS

PDF

33.4 KB Created: 2020-05-30 15:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f55af937365b47df8217e757b8a3a2fa SHA-1: a03ee0afc219bdba44fc1155cb23b38465a8440a SHA-256: 595850045e9df7fea5e9b20e8f427a4ad76e0ce455171962cd4f27acb0ec858b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a "PDF_SEO_LINK_FARM" heuristic. The document body, though partially corrupted, contains references to these URLs. This suggests the primary function is to redirect users to potentially malicious websites, likely for SEO poisoning or phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://jaguam.org/uploads/1/3/0/7/130776436/130776436.html#legrand+rex+2000+d21w+v%25C3%25ADdeo
    • http://ouafiertedimineata.com/uploads/1/3/0/7/130776447/c8f8913e.pdf
    • http://3sh.undesirable.us/uploads/1/3/1/4/131437770/013462da40.pdf
    • http://mpala.net/uploads/1/3/1/4/131483185/baxetodujorawomorad.pdf
    • http://counselinginlafayette.com/uploads/1/3/0/9/130969796/ae719e.pdf
    • http://kempsterconsultants.org/uploads/1/3/0/4/130435881/6d15ad7ef32.pdf
    • http://artcolorstyle.biz/uploads/1/3/0/7/130776147/b290f.pdf
    • http://realestatecanopy.com/uploads/1/3/1/8/131856176/6709457.pdf
    • http://samanthahoogenboom.com/uploads/1/3/0/7/130738780/siboli.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_off000054a8.bin
aee7e68fa3e6e812f48042cef0e6799ee1769b384e2ef226d13c4388d57ee7eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54A8 10920 bytes

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