Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f79955f8e8d7b0…

MALICIOUS

PDF

75.5 KB Created: 2021-07-16 04:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f32b9ce1725d08d495fc0ff20ac05bcb SHA-1: 362783b891ce113dd95a46574205b6f2d16b474f SHA-256: e3f79955f8e8d7b05b85a0ee90afaa03f455fc769d833b6d3c86c8ee4702b71b
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, specifically as a phishing trojan. The presence of embedded URLs, although many are confirmed benign, suggests an attempt to redirect the user to a malicious site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall indicators point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8972

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/UkUWPC8UKDU/square?utm_term=instagram+clear+messages
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0710a9383a81116919a87/1626370315068/67222998634.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f0b9355422dc4ac5bf890d/1626388789224/sample_letter_of_request_for_permit_to_operate.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8617c8b0d544b6d7e364/1626113559383/marvin_hitchhikers_guide_to_the_galaxy.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee517dfd66ff3739efc947/1626231166037/bebibejaj.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ede848a9aa746350ccedb9/1626204233104/nizulalekenedisenika.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f027dcb3de5a36b128950a/1626351580827/history_of_dragonspyre.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_off0000caa1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 16792 bytes
font_01_sfnt_off0000e2b3.bin
a821e99780a83a47f7628719db127824bb051b0b5eb7c5cd2db505d34378352d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 15784 bytes
font_02_sfnt_off00010b12.bin
a15b7e76da7c5ede57c8fec658d83b42e5768bae7f05d27a13715ea19eb481ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 10312 bytes

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