Malicious PDF — malware analysis report

Static analysis result for SHA-256 c650c408e8915537…

MALICIOUS

PDF

72.4 KB Created: 2021-07-21 07:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a01cd73193f4477ed9d162257735fe5d SHA-1: e780a8b0319c3df47afa726bd03375bf5f9615e7 SHA-256: c650c408e8915537fb5e0eae417b1a4e0560ce56b0f3face930eb6acb310ce52
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains embedded URLs, some of which are flagged as potentially malicious by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect the user to a malicious site, possibly leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6193

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/-7-cX3opz_8/square?utm_term=how+to+scan+multiple+pages+to+one+document
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0903e522b2a00fe728023/1626378302601/clade_meaning_in_marathi.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec78707e2b6271615a4e56/1626110064516/one_word_remarks_for_weak_students.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e91ccd025aa46e30d2993b/1625889998041/me_before_you_indonesia.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60eff57424fa75375d84728e/1626338676642/zutubozojamasovo.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_off0000bea1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA1 16792 bytes
font_01_sfnt_off0000d6b8.bin
5a6f222d3cc3bb470930442269088348c4d7eae16b7910f9e90513c14f604ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 10936 bytes
font_02_sfnt_off0000efd7.bin
73e943b88f4df8139aee527474fb2bdc2165396a72f9aa04de5e8c10fffd5a90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 14968 bytes

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