Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b6f98369fb1dbb…

MALICIOUS

PDF

75.0 KB Created: 2021-07-14 00:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8bcebb547d14eb0fe1c4ed88db2bcf75 SHA-1: a564026ed93ae94083e66d72a696f1146ad30658 SHA-256: a4b6f98369fb1dbbdc865bc09683fba7cd3f037b589ce12368528df02d730b9d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains embedded URLs, one of which is a Google feed proxy, suggesting an attempt to redirect the user to a potentially malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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/mHcMeCcfVl0/square?utm_term=highest+paying+doctorate+degrees
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee009080caa629c1dfeefa/1626210448118/what_is_a_form.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed97ea5a30a704d0bf7c70/1626183658769/bubijonuvepekopefi.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7fdc36d117d6eeca5a323/1625816515753/96489116339.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edfee99779423221e36a45/1626210025478/horace_ode_2.10.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ecabadf83a7f26ecd46bae/1626123182042/gekojiruvuzutegovunifer.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee048fad58ca03d22ade72/1626211471309/algebraic_expressions_class_8_cbse_worksheets.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8c3a31b0b43e07e7b7e2/1626115130847/atoms_and_nuclei_class_12_formulas.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eca9c7e0c99b3eb2d67206/1626122695347/sax_woodwind_and_brass.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e826c84d2175279d168191/1625827016299/all_sport_5000_series_control_console_manual.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_off0000c5ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EF 16792 bytes
font_01_sfnt_off0000de06.bin
0180d39a154295c837e693a5a1c81477728a7c4fd2344276d4c099dc5e1d13b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 10852 bytes
font_02_sfnt_off0000f6cf.bin
ae796b192e6b6dd2f5f45662d7afd67931589a968cf83e2a21aca8a9579f7824
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 16048 bytes