Malicious PDF — malware analysis report

Static analysis result for SHA-256 20dc4f63881d30d2…

MALICIOUS

PDF

78.7 KB Created: 2021-07-13 22:39:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 598df9980b6c3ebeb1c05f7eccf8f97e SHA-1: b761f0ca796ed26f3470d1e295276fb4cfede525 SHA-256: 20dc4f63881d30d2ea2599fcbfa90c1a58dbf99212f21002371db4b1ed8364fe
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Pdf.Phishing.Trojan. The PDF contains an embedded URI that points to a Google feed proxy, which in turn redirects to a Squarespace hosted PDF. While the specific URLs extracted are marked as benign, the presence of the ClamAV detection and the PDF_URI heuristic indicates a phishing attempt. No scripts were extracted, limiting the analysis of the attack vector.

Machine Learning

  • Nyx PDF Classifier clean score 0.1658

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/gOBB6uaVNRA/square?utm_term=summary+of+erik+erikson%27s+stages+of+psychosocial+development
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8df1b18245d33f17e3326/1625874203422/55611033043.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e827bbb977dd1475cd1ae2/1625827260011/vafebup.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_off0000d219.bin
ecd34f6f74592073659ea26fb44f1204ce9c577e3f484bad1cff1c422828899c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD219 16028 bytes
font_01_sfnt_off0000fb2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 16792 bytes
font_02_sfnt_off00011345.bin
d8ca25f13807b9f85c24a443525486482e1d1d477aba968022c29741a701fbe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 11548 bytes

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