Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e40ff3d9a75a1c…

MALICIOUS

PDF

77.5 KB Created: 2021-07-21 08:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bdf0fd2e2a2c8f3ba8e25b5b5b19c79 SHA-1: 57ae1c017fb594a69493ff18c73d2c9cfb6d55b2 SHA-256: e3e40ff3d9a75a1c89265a90c407457b657da35303825b3f7f1d6366b3590de7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, specifically the one pointing to a PDF on squarespace.com, suggests a potential phishing or malware distribution vector. The file's structure and heuristic firings point towards an exploit being used to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8897

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/HbdJGeoIq_s/square?utm_term=subsonic+and+supersonic+inlets+for+jet+engines+pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0decdc699444e2e3df941/1626398413891/22635815432.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f4ff490b1749089221e149/1626668873804/93048464859.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee072c4ff81d3e281882e3/1626212140566/26603043170.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f7b149896e5a6c1e32fd71/1626845513163/left_thoracotomy_with_decortication.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f70d3223e5fe23c47d9951/1626803506403/4091901342.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f5947017054365ca77b9e1/1626707056726/invoice_email_text_example.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_off0000d00c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD00C 16792 bytes
font_01_sfnt_off0000e823.bin
f166517be1236d7f1ddea4793ef5f1a28f71741da9cde7544a47e4ad0d8d5b51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 11240 bytes
font_02_sfnt_off00010227.bin
f1e93128a3aff34dc795314bf9c8f38ad8ea5aef8676dd52108b0132508e173d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 15528 bytes

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