Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8aa88d4adbb3133…

MALICIOUS

PDF

81.9 KB Created: 2021-07-17 10:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbb169686f9606f6c6fbd6332507eef5 SHA-1: 22c1d8ce651ba57aaf6acc76ef77fddea510a1a9 SHA-256: b8aa88d4adbb3133ecb218363720c4a0305bc0dc551eb1fbfce3ddb53117eef7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded URLs and obfuscated content, suggesting it is designed to trick users or download further malicious content. The presence of external URIs and the general nature of the detection point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5793

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/iCUEKX862tE/square?utm_term=3+chambers+of+government
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60efe27b96309e3685a98454/1626333820084/describe_the_different.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f1acae177559527f46e979/1626451118412/angry_at_me.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee48c19b1e4d6a360df5d2/1626228929258/73609305722.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed89655eed834fcc37ed48/1626179941433/online_free_autocad_drawing.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_off0000e022.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 16792 bytes
font_01_sfnt_off0000f834.bin
f2ffd0d2eb62b6d3c0324a7771aa959dc12dd2b6d630b36cbaf7e13cfacce4c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 16256 bytes
font_02_sfnt_off0001228c.bin
025a8da04dd66533b30bf6c87826e8f15751af4d3c84bc49c25abd6369187b8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 10924 bytes

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