Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a43e4620bf3e27…

MALICIOUS

PDF

77.9 KB Created: 2021-07-18 08:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a6f83e0e1e4bd5a319911ac86b5b08e SHA-1: 7ed9b26ae23eaaa4a7e60617881d837988ff2f27 SHA-256: 78a43e4620bf3e27951d205ad99ec29caddcfb9b3c8d494f80251d1028bc5712
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to external resources. The PDF structure itself contains anomalies and the ML classifier output strongly suggests it's designed to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/u8n3KCQdUYc/square?utm_term=cooking+with+caramel
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8d730c81c3e1fd72a3195/1625872176837/lanovoxesexuluguva.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0a2c0f623eb0f5f99fbb2/1626383041062/affordable_auto_repair.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8f728309bd63f3d8441a1/1625880360288/complete_electron_configuration_for_tin.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edb3f7c2b60e0ed5b6fdf7/1626190839186/rikajug.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e78d1d8ad60325f0c19e93/1625787677970/the_apartment_criterion.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7895bed7e6304395f2e98/1625786715849/god_hears_the_prayers_of_the_righteous.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee6b15c27d1e40a54d19f2/1626237717380/bree_tanner_from_twilight.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f1a42cf028704100439467/1626448940227/sivunereperezijo.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eda612a5c02c6ff4db2c1c/1626187282261/pdf_to_excel_free_software_converter_download.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee8f33e9cbfe6c2fec5466/1626246963361/cartoon_pictures_of_teachers_in_the_classroom.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_off0000d03f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD03F 16792 bytes
font_01_sfnt_off0000e851.bin
863e349514181a008a83159800a44c997eb73aea84666ef86ba12f54f91ec371
pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 16604 bytes
font_02_sfnt_off00011316.bin
1a9d64a4824f863d4277ce4f6014970c692bebbb599c188ab30d27a2e5375602
pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 10716 bytes