Malicious PDF — malware analysis report

Static analysis result for SHA-256 c433d25e038c8158…

MALICIOUS

PDF

80.2 KB Created: 2021-07-15 19:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9edf231f729f48a11513f1708f71b43a SHA-1: c1222b8436d02d2574d49488f13f5fdd31ab089a SHA-256: c433d25e038c815895d93728fb54547823df6fdafe28cee5564199f03e1204bb
96 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or exploit delivery mechanism. The PDF structure and heuristics point towards an attempt to exploit vulnerabilities within the PDF reader to execute arbitrary code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

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/iCUEKX862tE/square?utm_term=boys+over+flowers+episode+65
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecc7b5c38c70342faf1ded/1626130358034/combining_a_queenless_hive_with_a_queenright_hive.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec787c700aa07a7893a726/1626110076539/english_to_indonesia_translate_online.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c5e64be6b65fb4b11f5d/1625867750464/bulimia_eating_disorder.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_off0000d375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 16792 bytes
font_01_sfnt_off0000eb87.bin
ec0122074860feea1e67d1a79d68121e64e83d8e7b14e4dd08df5eb7525cbc78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 18584 bytes
font_02_sfnt_off00011a85.bin
c2eca5e5b99d342872f13b5de7d5abcec7a638206129b5445de3f8723f8b85d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 10748 bytes

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