Malicious PDF — malware analysis report

Static analysis result for SHA-256 d973a1d6ff699afd…

MALICIOUS

PDF

85.3 KB Created: 2021-07-13 00:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94fdae694bf554f7e9dd56f8e6d1aea0 SHA-1: e33e1629d6d0fe75e1884e58278e39a166984510 SHA-256: d973a1d6ff699afdc95682c07a0973d2aadc925fc02a7af323eafaf99ea42de7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by both a machine learning classifier and ClamAV, suggesting it is a phishing or trojan delivery mechanism. The presence of embedded URLs, although many are confirmed benign, indicates an attempt to redirect the user. The file's metadata shows it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which could be leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5817

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/uzX87CUNjRg/square?utm_term=life+in+the+victorian+age
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7d64700aa07a78943c88/1626111333120/vulelugiliduberupinisin.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecafdc5f54a92f3bf7db9b/1626124252826/what_is_it_called_when_a_gas_changes_to_a_liquid.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8167280504e0a776c0528/1625822834521/21982961395.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e76fc8bfac8661220cca0e/1625780168983/quotes_from_chapter_5_lord_of_the_flies.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_off0000eeeb.bin
5a8b5290d6071cee46bc9b29c7c35121138213f1f9ad38dfdddd0bfc19be24a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 10424 bytes
font_01_sfnt_off00010680.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 16792 bytes
font_02_sfnt_off00011e92.bin
afc4a8a4c63ba815828fa741aaf9cb1b003a62a166d75c4cf96703cb0c926c06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 16468 bytes

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