Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0665cba4113bbc…

MALICIOUS

PDF

91.4 KB Created: 2021-07-18 09:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40e9a0b969a02a6e2e187ab8e9446144 SHA-1: d29c605e92156f1f69f15c0694467a0099113489 SHA-256: 9c0665cba4113bbc67e1e60d05a2ad0df0a182e3dd388cff2ac8ba2d97e66793
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document's purpose is to trick the user into decrypting a malicious archive. No scripts were extracted, but the presence of embedded URLs and the overall detection suggest a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/~3/1LSSs5qy-i4/square?utm_term=terraria+connecting+to
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f3acb0783e880aac843cfe/1626582192893/xatudaxexapatutubije.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f3bcf8a8f65e35b6ddf3de/1626586360682/download_software_to_excel_free.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f3aec5a047b6361228ee2f/1626582725486/volume_of_a_dodecahedron.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f3bbc0783e880aac84b2b1/1626586048212/demonic_letters_copy_and_paste.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee3a804d490f672751b93b/1626225280667/66220573402.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0c3a8a57b467a228ae22f/1626391464571/can_you_notarize_a_will.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee68ee4d490f672754cacf/1626237166205/juvadetineropavimozivare.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f3be541d35070742236a54/1626586708667/pivoxidizawiwujuzuzusut.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0d8e7c825a553dff07599/1626396903953/nuxumaloxibogomebug.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_off00010428.bin
63397d13f0c5db7e641ff30bcd0af785eb7a92b8331639d5af372060ef3fe4e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 10156 bytes
font_01_sfnt_off00011aff.bin
d3d1bca8891a85160107ba811ba15854a5641c5a5229155b1821b667d8130166
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 17928 bytes
font_02_sfnt_off000149cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149CD 16792 bytes