Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a5d9b5e59ecf13…

MALICIOUS

PDF

77.8 KB Created: 2021-07-19 01:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4a9ef9d12c3440c4294b460dff259dc SHA-1: 004c0d0714cef9d2024cc4ab5fc1c2e3e23190ae SHA-256: b1a5d9b5e59ecf135858382115ef0de2cb14fd9e222af460ac1f8a0b6ed5636f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains embedded URLs that lead to seemingly legitimate but potentially compromised Squarespace domains, likely serving as a lure. The PDF structure itself is suspicious due to duplicate object bodies, suggesting manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7691

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://feedproxy.google.com/~r/sq/ugae/~3/um1bUVUAM38/square?utm_term=101+conversation+starters+for+couples+free+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ede471ba7c7f743c1dca4c/1626203249673/rawowetutajegu.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edcfba8e89d93564d36702/1626197947015/83137538450.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f49f5526e2e727c2700a24/1626644309199/12007281882.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf89.bin
4d28da8d417be71b55a1404ef4c45479017644d5e5567ffdd2d4796da00b9fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF89 16412 bytes
font_01_sfnt_off0000f9ab.bin
e85a896a774bee6374b42c5199698588aecd00b97734ba5636b4d23d92e7ca37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 10856 bytes
font_02_sfnt_off000112e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 16792 bytes

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