Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c69ac8f7843911…

MALICIOUS

PDF

100.6 KB Created: 2022-04-12 05:17:42 Authoring application: Bristol University Request Information cphv (via FPDF 1.82) First seen: 2022-07-15
MD5: c0fc7fffc2418f951453ae5c84d166f0 SHA-1: 87391e70c78b5515d7929290083a3e0348b5b025 SHA-256: 45c69ac8f78439110ad67de2b649486b9608e234bdc0696a71b2769025cc82a9
62 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with a critical heuristic indicating repeated invisible links designed to trick the user into downloading a payload. The primary malicious URLs observed are http://msfnbldc.site/Bristol-University-Request-Information/pdf/www.downundersail.com and http://msfnbldc.site/Bristol-University-Request-Information/doc/www.downundersail.com, which likely host the secondary stage of the attack. The document body itself is heavily obfuscated and contains further links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0010

Heuristics 2

  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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://msfnbldc.site/Bristol-University-Request-Information/pdf/www.downundersail.com
    • http://msfnbldc.site/Bristol-University-Request-Information/doc/www.downundersail.com
    • https://www.downundersail.com/wp-content/uploads/formidable/4/bus-travel-with-a-warrant-ohio.pdf
    • https://www.downundersail.com/wp-content/uploads/formidable/4/summoners-war-water-homie.pdf
    • https://www.downundersail.com/wp-content/uploads/formidable/4/hfr-global-hedge-fund-industry-report.pdf
    • https://www.downundersail.com/wp-content/uploads/formidable/4/hispanic-association-of-corporate-responsibility-bylaws-pdf.pdf
    • https://www.downundersail.com/wp-content/uploads/formidable/4/french-and-indian-war-worksheet-pdf-answers.pdf
    • https://www.downundersail.com/wp-content/uploads/formidable/4/canada-business-expense-spreadsheet.pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_013_off00018743.bin
43b13684882d332187dbe2691d5e4f64c33a98e381a4dc2316374ba1b923b47c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18743 76950 bytes

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