Malicious PDF — malware analysis report

Static analysis result for SHA-256 85166e8a19d7aa80…

MALICIOUS

PDF

80.5 KB Created: 2021-07-17 22:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 067b75329b2f5d65d52fb46414cbbc7b SHA-1: 858ea07c1a24ca7db672e846bb9ab3963af1e61a SHA-256: 85166e8a19d7aa80edc3bce5f9f85570020290687ef63cc8a9e4dde85be3b450
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains embedded URLs, one of which is a feedproxy URL that redirects to a PDF hosted on squarespace.com. Although the document body is heavily obfuscated and unreadable, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8666

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/razvivatel/yapz/~3/7R6buoffwiA/square?utm_term=burke+reflections+on+the+revolution+in+france+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec924ce7718717d7633e63/1626116684854/84645572786.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7ccd6f29cd6423db3c8f6/1625803990219/volevazi.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f2e7cd27519501fc0c6950/1626531789272/xulobabif.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8607e82957a3103692274/1625841790191/dead_by_daylight_myers_build.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed9724c8cbd011b90b5e6b/1626183460595/around_the_world_red_hot_chili_peppers_tab.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edc56e4c056a31b8189721/1626195310446/increase_snap_score_quickly.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec9e92973f9128ac6d3e11/1626119826648/adding_fractions_4th_grade_worksheets.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_off0000d6f2.bin
66d035831af3bc7b1864304143ab4fb2ff7316880c1f9469ccbdcdadf02530f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 11028 bytes
font_01_sfnt_off0000f09e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 16792 bytes
font_02_sfnt_off000108b0.bin
ce5a22fd78517ed3de6403a9085fef23bdea35faedb332e57556b649869c43af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 17600 bytes

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