Malicious PDF — malware analysis report

Static analysis result for SHA-256 dafe4b43dd6f1907…

MALICIOUS

PDF

75.0 KB Created: 2021-07-21 04:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c0bafc774263c4c47479fc6985f05ed SHA-1: 2eb5a1a6cabd67cd511c8c66e94469446cc081d4 SHA-256: dafe4b43dd6f1907d2848d47f2de2884866fd0c8c1645f6d975a6da753a71d21
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing attempt. The presence of embedded URLs, though marked as benign, suggests an attempt to redirect the user. The file's structure and metadata indicate it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be leveraged for phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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/mHcMeCcfVl0/square?utm_term=english+notes+for+class+11+kerala+state+syllabus
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f55ecbc0fa6a1644f695a1/1626693323656/nuvaxodisemukux.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee41d4f72ce0266e101cc2/1626227156885/hibiscus_and_butterfly_tattoo.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f0288197dca740078fa339/1626351745454/3_months_vaccination_for_baby.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_off0000c3f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F9 16792 bytes
font_01_sfnt_off0000dc10.bin
8af1f0cfbddb17c0f3c1d8ebd3f0ed2045b43fe1d520797afb48951861ac2daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 11096 bytes
font_02_sfnt_off0000f5f3.bin
65f41ff7e2b252fdb42d59fcf33a2b1cab939b3625bf91c6adb1b5195951898c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F3 16304 bytes

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