Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9446e326613892c…

MALICIOUS

PDF

79.0 KB Created: 2021-07-14 07:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ebbeffa682adadb0bd1c05ec4e6d3f9 SHA-1: 90eee8da73e629e7d1914b908f93d1023bb9b672 SHA-256: d9446e326613892caf4a428844a36d88873efe05596ef840b1bb056b8545fd8a
96 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious content or download further stages. The PDF structure itself shows signs of manipulation, including duplicate object bodies, which is a common evasion technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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/eaN1Eb74jJI/square?utm_term=how+to+use+tranquilizer+arrows+in+ark
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee4ea58e3fff2bd3c1c092/1626230437163/degenerative_subchondral_sclerosis.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e774204abb634903c96b9d/1625781280259/69590373025.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e9111d787dde1a90ad7de6/1625887005777/kixufodudunisiw.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eca1198c19ad4998ddd3f0/1626120473656/30200980861.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8965426d281541e6f6ca1/1625855572411/6561848460.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee192e6d75c50a5d410bcb/1626216750662/60961890250.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8eaedf4fe78435a37f01a/1625877229679/mozetulitidoga.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e93f56320dbd0de2820549/1625898838433/32976543661.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e93593b673687559686b6b/1625896340032/what_is_hybrid_fund.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_off0000d21b.bin
6edf88b90d0b8f4486ed9388b30576bea6cc540759e338a8294792afe14610ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xD21B 17196 bytes
font_01_sfnt_off0000ff42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 16792 bytes
font_02_sfnt_off00011759.bin
36c053997179c153a7f992197f7c9ca13c31a19912600ef7bc0776591241386f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 10576 bytes