Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88275407892223a…

MALICIOUS

PDF

74.0 KB Created: 2021-07-13 18:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9338278d93e9361199352fc095bd1838 SHA-1: cd5806241e4cd243e3c12fd362a228805337ee44 SHA-256: c88275407892223a84582037d8af528e8aba6f63f37df532f20c3c91075c9949
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains an embedded URI pointing to a URL that, while currently flagged as benign, is part of a pattern often used in phishing campaigns. The PDF structure itself is unusual, generated by wkhtmltopdf, and contains obfuscated content, suggesting an attempt to conceal malicious activity. No scripts were extracted, but the presence of embedded URLs and the ClamAV signature strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1751

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=codes+for+snake+io PDF link annotation
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7aa0a9bae382bbabccb54/1625795082260/southern_twin_girl_names.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 16176 bytes
SHA-256: 0b38b05097b804506b787c08de0dd3fafca1d9c9863e718a54df7a337ea3519e
font_02_sfnt_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 10324 bytes
SHA-256: 259158984d7f987180ad239145a85b37b6af7791b72631fe394dad0614750efb

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