Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc2366a918aa61f…

MALICIOUS

PDF

73.1 KB Created: 2021-07-13 14:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d200321218eebe24c84aaa34fc4b72b6 SHA-1: 62fb932def908f9c29f5e6891610e7b2bbaaa0af SHA-256: bbc2366a918aa61f37a4ca321f50b9f9d089ee4158625dba6830b499b94d6f1c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect users to potentially harmful content. The PDF structure itself contains obfuscated data, and the authoring application 'wkhtmltopdf' is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6403

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/mHcMeCcfVl0/square?utm_term=draw+a+diagonal+line+in+photoshop
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8f5ac81c37306b2f8c2b/1626115930945/marketing_proposal_email_sample.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8715a211c9314ad40bcd3/1625846108072/how_long_does_a_moving_violation_stay_on_your_record.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec802a67baa26076bb6c90/1626112043069/69195859402.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_off0000c039.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC039 16792 bytes
font_01_sfnt_off0000d84b.bin
3693bb2498b7cea5487122cb499916b1134a423cf9b783eaab09af891b15bb77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 15588 bytes
font_02_sfnt_off00010027.bin
7a7df638eab8d2c2fb6e19c1a89efd4f73346661d1c7c8546d60d21819539724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 10756 bytes

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