Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5f5dc7be6fb558…

MALICIOUS

PDF

77.7 KB Created: 2021-07-12 22:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45b32b1e033d93735e28b559d3dc9987 SHA-1: e13705cf15b85385988309d2c28cb0561f2fc421 SHA-256: ed5f5dc7be6fb558e8511cd86104530bb532e6c72dbaa8a736dc7afb68f4dc03
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of embedded URLs suggests an attempt to redirect the user to malicious content or download further stages. Although no specific script content was detailed, the PDF structure and embedded URLs are indicative of a phishing attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7939

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/UZrB20b2Dcg/square?utm_term=pharmacological+effects+of+ace+inhibitors
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8fa328915684aa53b94aa/1625881139140/xenatolizegefu.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8b953c0e666153b739ce8/1625864531628/kate_and_queen_elizabeth.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8adbe12383e52639f4115/1625861566364/how_to_do_chicago_endnotes.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_off0000cadf.bin
c15aae85d41917eede621b27a06f7d36d4595845b8fc4f0a8ffd58587fcfe534		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCADF 17220 bytes
font_01_sfnt_off0000f846.bin
158d57e46ceb4e8a20eeae2bcf7c22fc33426145857b0b565e960bad0d39d36d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 10924 bytes
font_02_sfnt_off0001116a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1116A 16792 bytes

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