Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e79c5f0d3c9fcac…

MALICIOUS

PDF

79.8 KB Created: 2021-07-16 06:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64228b7f88e713d8e688e6f216aacb81 SHA-1: eca395b94804989bc0237a3d3f9485b3602399d8 SHA-256: 5e79c5f0d3c9fcac16de0728b79ab1660911113f30810d1484807014cb39ccf4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded URLs, though many are marked as benign, suggests an attempt to direct the user to external resources. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall context points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8187

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/S-4CHg4Qmwo/square?utm_term=how+to+extract+pictures+from+pdf+files
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee90e7db6052518ecad32d/1626247399829/volleyball_vocabulary_worksheet_answer_key.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec9429af807f1e1526ca44/1626117161741/65957060039.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f025a4c0b35f4fb3dca327/1626351012706/barry_pepper_saving_private_ryan_quotes.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0d3f178fb23041afc6caa/1626395634058/dont_you_forget_about_me_mp3.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edae7bb564270cd6eaceab/1626189436069/making_timely_business_decisions_with_sound_judgment_appraisal_comments.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8be56d2f17c4cdf3f97fd/1625865814909/wububabatujemijexitokuza.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_off0000d377.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD377 16792 bytes
font_01_sfnt_off0000eb8e.bin
f270be7870acc71a8b5543f3cff187dc88733e1b191322f057ca2b8f7f7739fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 10956 bytes
font_02_sfnt_off00010508.bin
bd35e21e6c3612ad1af6a711128f2df6e1c7879981d23c854320ea8fd5799633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 16976 bytes

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