Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36de9f2a1a108f2…

MALICIOUS

PDF

78.8 KB Created: 2021-07-13 17:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4b7af20ea19e3d15925ef73c76e269b SHA-1: 32c3fc13161093095d65591ca2a01362c08f0e25 SHA-256: b36de9f2a1a108f2bcbceaeb671c08db5c0fd501b5cba49938d270eaa2694328
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to external resources. The obfuscated document body and the PDF_URI heuristic point towards a phishing or malware delivery mechanism, likely involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8374

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/gOBB6uaVNRA/square?utm_term=cold+beach+day+outfit
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eca71e05183b3b57a0ce01/1626122014456/coulombs_law_practice_problems_answers_key.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e785b67ef31d0d76ee00ba/1625785782279/hungry_dragon_mod_apk_unlimited_money.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed9cc97c55557fb27d24ba/1626184906448/3296901536.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ece4e82ae47d2ac91b87b8/1626137832201/47619264456.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec85c00d838b6c850d24b4/1626113472168/life_skills_questions_and_answers.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_off0000d539.bin
569fe716cbd088d547ae8453dfef5ea604162a5a898415d8aba7c53c5fcab8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 16216 bytes
font_01_sfnt_off0000ff3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 16792 bytes
font_02_sfnt_off00011752.bin
d8ec4b9d27e6a8acbce9b2a592d41234a115bcf392d49b7acd14927e5258d600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11752 10588 bytes

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