Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc554aa2aad07bac…

MALICIOUS

PDF

103.7 KB Created: 2021-07-13 19:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b5bf4a706ff38bd20a59e6a45aed8c9 SHA-1: 166b837687c22b1cd0ef9003bed32499a4de4fa0 SHA-256: bc554aa2aad07bace9d5aebb31d1d947cf1eb4098af3f90156270e6237545e75
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to potentially harmful content. The document body is heavily obfuscated and unreadable, providing no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7979

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/iXsW93xxTQA/square?utm_term=what+is+the+end+product+of+the+calvin+cycle
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8593eff5b651d083e9fa0/1625839934930/ameda_purely_yours_breast_pump_manual.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec9161f4b4775d04a06627/1626116449441/13317187488.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7dd14c0b954f9ea3a353/1626111441169/download_gta_3_in_pc.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8243a5c1b84600341aedf/1625826362744/past_tence_of_bring.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e95114f107ff2467ea6f79/1625903380459/joxilewade.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8a5ad4b0a8d5efe5a1cb1/1625859501822/xawuw.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edac9a1374dd6a9a64f250/1626188954965/leaving_school_quotes_funny.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_off00012f18.bin
52c6cdea8dee74b96117df74f672b671a57e570cc5c65e0eb3c6818d7a9328ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F18 10992 bytes
font_01_sfnt_off00014893.bin
627ad8a5c9ee0fe76faf9ea59382d7abf2d9bb20d131c175459cfbb378066455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14893 19068 bytes
font_02_sfnt_off00017a78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A78 16792 bytes

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