Malicious PDF — malware analysis report

Static analysis result for SHA-256 434c55d2e55ba4de…

MALICIOUS

PDF

82.5 KB Created: 2021-07-18 00:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d37f8ff6ea6e7fa7477c644dbeffdd6 SHA-1: 65c1afe05b52e660a164f4568fcee3b3c294ecbb SHA-256: 434c55d2e55ba4de825b82f4297b8e4dceb27346e694064969e21e95d4b87db3
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability for client execution. The presence of external URIs, though marked as benign, suggests a potential for further malicious activity or phishing attempts. The file's structure also shows signs of object duplication, which can sometimes be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/-MXWpcYQ7kA/square?utm_term=bowel+resection+and+colostomy
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f346e5a9adb72803a662fc/1626556133478/21287426794.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e856ab45407067ba69244e/1625839275753/repepefifiz.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f344fc2e59700d3e5da11f/1626555645023/model_activity_task_class_10_english_part_1_answers.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7f6d98592fe3a5892bc3e/1625814745098/nice_thought_for_best_friend.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec8f8545711547b6a728be/1626115973311/tom_and_jerry_classic.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_off0000e1f4.bin
e0d3cebbc96e9dc4b2060fee0388597f511c4fafec5cf5bf17b8e66d12b7a6a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 10784 bytes
font_01_sfnt_off0000fae0.bin
da5dbf2c87efa5f09378980186e9b4679f5f5d66f311d5ee6cf24763f39ccc22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 16484 bytes
font_02_sfnt_off000125ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125CE 16792 bytes

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