Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f28af670760b1e5…

MALICIOUS

PDF

77.1 KB Created: 2021-07-14 00:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c527df6a6f1dff63e115ee46634aaf5 SHA-1: 50ba17bec0f9159200d86a434fa00c2038b4fafa SHA-256: 1f28af670760b1e551220a74dd80cdedfab048f44f468a938484f259fe281459
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a phishing and trojan detection. It contains embedded URLs, one of which is flagged as a potential phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/eaN1Eb74jJI/square?utm_term=volume+is+an+extensive+property
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee01714c056a31b81ef2b4/1626210673825/memiwusojusox.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7b94fbab0621613369a11/1625798991529/inquiry_letter_for_university_admission.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_off0000ca57.bin
9817de796932b540bd0d7aa4b62fe37dfdb734381ee75aec069e14aa10717b3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA57 17348 bytes
font_01_sfnt_off0000f7e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 16792 bytes
font_02_sfnt_off00010fff.bin
f626af101e6126ed662bfc5ccd21e8eff198609c11f684699231e289ab903abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 10764 bytes

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