Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11035c066dfd215…

MALICIOUS

PDF

74.4 KB Created: 2021-07-15 22:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff5cff878fae8c468d1996f45d49697b SHA-1: 8ad23d4a2f8bbbc5731686a9acdec599ab3f1061 SHA-256: e11035c066dfd215691751454e0b89b03733f46e7ca34aeabf01d59e37fdc640
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, even if some are marked as benign, suggests a lure or redirection mechanism. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to exploit vulnerabilities or redirect users. The primary IOC is the embedded URL which may serve as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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/eaN1Eb74jJI/square?utm_term=how+to+find+out+valence+electrons
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e90e51b67368755966fdad/1625886289409/85946565968.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e77bab397fa11ba24b2492/1625783211855/max_th12_troops.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecad487a6a1626764ccbc9/1626123593301/science_textbook_for_class_9.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec90f990a3fc49531a68c4/1626116345748/louis_the_viii.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_off0000c1de.bin
2389881245bba05cfc6bc707edca7944ba1958f65684f3b829280165235c93b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DE 10712 bytes
font_01_sfnt_off0000da98.bin
787c8188c4e483108289e317dfea86977d0451c93df56909ee5b9bd7424ec207		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 16748 bytes
font_02_sfnt_off000105f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 16792 bytes

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