Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f28739ce2322601…

MALICIOUS

PDF

77.6 KB Created: 2021-07-15 20:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: beb92e3720c2dfa9192205549d16c739 SHA-1: f2e8aa39826b071dead237264a774b226bd658a6 SHA-256: 3f28739ce2322601b6764e3859666fb9455712440b4232248d9d37d00b77bf5e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. It contains embedded URLs, one of which points to a PDF file, suggesting a potential lure or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the nature of the detection indicate a malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.1551

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/razvivatel/yapz/~3/nCRFBnYrBHY/square?utm_term=pronouns+and+antecedents+worksheets+pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e79df5ce8457037edf32f6/1625791989713/wild_party_meaning.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_off0000cff1.bin
d673a520e65543d56b160e62527948bd32b6757b512e88fec59ffbd8fa76a0de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF1 10860 bytes
font_01_sfnt_off0000e91f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 16792 bytes
font_02_sfnt_off00010131.bin
1b08cca7957ede58643eea1f73a8baea11b2f3858504112b85c13b1e84fc818c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 16000 bytes

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