Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5953bfec3c8817c…

MALICIOUS

PDF

82.0 KB Created: 2021-07-19 00:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e64e8944e483679198c4f35a8faab309 SHA-1: 87ed3829064d46017f061ce305b49a3faf57ae4a SHA-256: a5953bfec3c8817c7c513814dc5cd1f8f5dd95f54f20a0564b7b861fe5048bce
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI that points to a URL, which is a common tactic for directing users to malicious sites. Although the document body is heavily obfuscated and unreadable, the presence of the embedded URI and the malware detection strongly suggest an attempt to trick the user into visiting a potentially harmful external resource.

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/k6oGaauGqGM/square?utm_term=toefl+reading+practice+pdf+with+answers
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec96160e7a3c5fba3f2333/1626117654994/girl_healthy_weight_chart.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8cfab8c0097185606962b/1625870251644/behaviourism_theory_in_teaching_and_learning.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e882117204344d3f46857a/1625850385506/agriculture_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_off0000df3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 16792 bytes
font_01_sfnt_off0000f751.bin
3eb1dc04612963e64576934889ab07f2cd57f1c252905284dcf6e91652d19337		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 16820 bytes
font_02_sfnt_off000122fd.bin
abd3d587258e4471bf3016b2e0869e0f7884b350b08b453e5dcb4f2c8d9d3a63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122FD 10948 bytes

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