Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca57e5ec64ed348d…

MALICIOUS

PDF

74.1 KB Created: 2021-07-17 02:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01eef579d2e13989652fa0bb348e9cc9 SHA-1: 710845221bdea0a49be11526c3adaf4326b318ba SHA-256: ca57e5ec64ed348d7e092980d58b1c9551f6ff9bbdf950b6adb09a97a2756dfd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as a phishing trojan. The presence of embedded external URIs suggests an attempt to redirect the user to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.2401

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/nCRFBnYrBHY/square?utm_term=convert+to+compressed+pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec9401973f9128ac6c41c3/1626117121577/jobiz.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7d4319a16f038d61a56c/1626111299624/88302870026.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_off0000c191.bin
6bfa8bb19939bc3305004bafc66d879f5e140579f6d751b35a752e2cc4b4f964		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC191 10576 bytes
font_01_sfnt_off0000d9c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 16792 bytes
font_02_sfnt_off0000f1d5.bin
2b4ec0ef8ba7069695ed0a103ae23425d67d082372a45e1c91c95e4df6ff6c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D5 16152 bytes

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