Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6ea3736b55c512…

MALICIOUS

PDF

73.7 KB Created: 2021-07-16 08:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee4d618c39df4621099c6024e8f5391a SHA-1: 956c50649fd5a0f36f71c017427c206ecb5a247a SHA-256: 8b6ea3736b55c512e37e1c270fc018396a353ae0a74c456c48762aafaf9ab42c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs and the PDF structure suggest it is likely a phishing document or a dropper for further malware. No scripts were extracted, but the PDF's nature and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9186

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/eoPDrVzwpx0/square?utm_term=driving+lessons+for+beginners+pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec9dd3f4b4775d04a1960c/1626119635452/xujewav.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee299a9c71001bedf47bd9/1626220954349/fapadelazulexuxi.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e77b1200780223f09d820e/1625783058991/91758417174.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f03572cd1cf129e16619c9/1626355058996/types_of_lute.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee6750fd66ff3739f0fd12/1626236752406/lodekelifi.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_off0000c540.bin
fb673179be87e9a99ed73946f0e8b0b26dd5f1ede141a9d95b8c9fc30080af90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC540 10620 bytes
font_01_sfnt_off0000dd2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 16792 bytes
font_02_sfnt_off0000f53e.bin
3c95f03989abe4c49cb4532f07b789110619888a7efc55c2654c733212d91b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 14956 bytes

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