Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c88767de8005e0e…

MALICIOUS

PDF

77.6 KB Created: 2021-07-15 13:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a23eee92c85dc78dd7b08bd7212f5185 SHA-1: 3829e07db68c462d2b545cc5e4bfa75ce6ddb129 SHA-256: 8c88767de8005e0eef60d368d882f9c7ea8ad5cb7486cfc6dfeb54207ba541f2
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 PDF contains an embedded URI that points to a URL, which is a common technique for phishing or delivering further malicious content. Although no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9214

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/CcIy6vlvkUk/square?utm_term=synonyms+of+clear
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e932ffb9b95949b65f5200/1625895679285/riwerezudurelurod.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edfc4c2e8a4a2aca7d4eb0/1626209356874/nefizik.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e76a63b96d4839c800adf8/1625778787985/welcome_first_time_in_korea_season_2.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee09206d75c50a5d3faf89/1626212640630/2535664698.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60efe3e7d9659e278644dccb/1626334183321/36_teaspoons_to_cups.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e91f22db8bb141bad94e29/1625890594465/right_to_education_notes.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7dab39bae382bbabf7795/1625807539428/confidence_interval_for_mean_and_proportion.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_off0000ce5f.bin
8949aa44508e9774f06947391e435513b3aa683b700d39785b11b9ab16b9255d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 10496 bytes
font_01_sfnt_off0000e63c.bin
493adb68efdf0e801353c745843792a70f99650833f2c4a9e0ada353fd2ec60d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 17164 bytes
font_02_sfnt_off000112d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 16792 bytes

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