Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e16ebd119834659…

MALICIOUS

PDF

78.7 KB Created: 2021-07-14 08:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 675661fdedc97ca4240e4b78ec478b18 SHA-1: 14b81bb929d163f631af4c1e502b20f1f4d4e77f SHA-256: 8e16ebd119834659ab630559033109fc629c68f5ee57278b7fef0988309a1e30
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, even those classified as benign, suggests an attempt to lure users to external resources. The file's structure and detection by ClamAV as 'Pdf.Phishing.Trojan' point towards a phishing or trojan delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6198

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/J-SxIuB37Ms/square?utm_term=is+roast+beef+bad+for+you
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee24602485902f3e719641/1626219616545/physical_geology_plummer_14th_edition.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edc5a6f6d8087912bbe6c1/1626195366445/kogat.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec9a4be0784948549a9388/1626118731665/9th_class_english_chapter_1_the_enchanted_pool_question_answer.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_off0000d408.bin
d0f90e48d7a7cd5a7ee3ea39c9d4f9e445ad85a22c1586d307bdc962885108ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 10412 bytes
font_01_sfnt_off0000ebd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 16792 bytes
font_02_sfnt_off000103e3.bin
587940c7322d13f23590f60653937b333f6962f030dd52477ea6966079445a79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 16628 bytes

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