Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ae739bf735feeb…

MALICIOUS

PDF

79.3 KB Created: 2021-07-16 02:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0cee4856bff6c130ea75b0bedc356ed SHA-1: 86b6f1a32b0057ab64ea89f97586952c8a12fda5 SHA-256: b2ae739bf735feeb91e30f45e5f41e70c1a7963186aeedf93a5799bc63ba94a1
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a callback phishing lure, prompting the user to call a phone number for issues related to billing, refunds, or security. While no scripts were extracted, the presence of embedded URLs and the ML classifier's output suggest malicious intent, likely to trick users into revealing sensitive information or making fraudulent payments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6665

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/rCno-htTzZk/square?utm_term=streaming+drive+me+crazy
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec899cb8cbe518df588224/1626114460609/20940224720.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60efeed6a26b2b69a35c8e57/1626336982160/vuvunitoxeli.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f0668749bf6a548c858400/1626367623462/apply_for_pandemic_unemployment_assistance.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_off0000cfdb.bin
b49be8f38e37573dca9080d280433a6428868f89d245f880cb0aab7837e48aec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDB 10696 bytes
font_01_sfnt_off0000e839.bin
3e0e4b4d54f86909a58fae5af296f19d6d7f10f50f2fb3a8df0ccafd3a574c07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 17996 bytes
font_02_sfnt_off000117e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 16792 bytes

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