Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ef10e0fe2fc1dd…

MALICIOUS

PDF

73.7 KB Created: 2021-07-15 20:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 570f56fb1614f2651c5964adceaebe86 SHA-1: bc95fb5013006271d613126a791f4e8d84fdc15f SHA-256: e7ef10e0fe2fc1dd4aef4a9d0ec45af52f954ddd3839327d717eebbab024c9ec
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as a phishing trojan. While most extracted URLs are confirmed benign, the presence of an embedded URI and the nature of the ClamAV detection suggest a malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern points to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2592

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/~3/1LSSs5qy-i4/square?utm_term=small+football+field+size
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edba99811aeb4b658003a3/1626192537318/a_dna_strand_is_made_of_nucleotides_which_make_up.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec95bb97282d6f4691cdb1/1626117563128/85381050874.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_off0000bfaf.bin
9e039da32fa020b3e49fe39f4850d3feef5c8b60f7fe32143bbf45bbde43078d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAF 16656 bytes
font_01_sfnt_off0000eb04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 16792 bytes
font_02_sfnt_off0001031b.bin
e6af20870d3b7d27ca8e31b44d483d13fcd78b0ce7087188af8038097f0a8064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 10584 bytes

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