Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad86b7ef1bb32a9…

MALICIOUS

PDF

73.6 KB Created: 2021-07-13 22:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6ff813964d08ec80125e3d7bf357602 SHA-1: 9fde1bab7a1f04dda66b43133515612bda6ccdbb SHA-256: 4ad86b7ef1bb32a964eb84ed8f14ef39c47e47d4e5992ac9777b97da96996f81
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or malware distribution vector. No scripts were extracted, but the PDF structure and heuristic firings point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7395

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/razvivatel/yapz/~3/UZrB20b2Dcg/square?utm_term=to+stop+hiccups
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7c5b385664d35b0e66972/1625802163511/73459216030.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec90f9973f9128ac6be050/1626116345618/gosexita.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9232dc4c1a734c5d6d6e2/1625891629854/date_of_easter_in_2020.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_off0000c1e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E9 16792 bytes
font_01_sfnt_off0000d9ff.bin
9a66e5b3904311c78a0973e004568d70db9f94ce6151fe79e141b82f9c016e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 9988 bytes
font_02_sfnt_off0000f053.bin
b1c4d11e266c6d6f2d9879f382b1ad0862920b275f33d92ca144aff64d82950d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 15988 bytes

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