Malicious PDF — malware analysis report

Static analysis result for SHA-256 595b34465b7f280a…

MALICIOUS

PDF

74.9 KB Created: 2021-07-13 20:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab3a7a8d6c96e58434f5046a14a22484 SHA-1: 5db278f14dc9384dc68b1f3b3e97ece97c33d672 SHA-256: 595b34465b7f280aabb78e06459f7b6df0b122f961ffd0452701a51da022fdd6
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it's a lure for a password-protected archive. This suggests the document's primary purpose is to trick the user into providing a password or opening a subsequent malicious file, likely to bypass security controls. The embedded URL, though benign, is part of the document's content, potentially used in the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/um1bUVUAM38/square?utm_term=how+to+open+pst+file+from+outlook
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e93e62085b1c120f991e03/1625898594192/medial_lateral_ligament.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8e82934d360eb2891d86/1626115714430/40241279538.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e894e0d0776f4d52ce4a78/1625855200246/89984179008.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec9131934d360eb2896109/1626116401214/nikefazakijexeten.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec92e93080d76c7a51fedf/1626116841602/ba_of_science.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_off0000c3ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EE 16792 bytes
font_01_sfnt_off0000dc05.bin
244535ecf04054468ab1088e8174ca5e0cc267118966d72b195f55e22aa0d629		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 10624 bytes
font_02_sfnt_off0000f456.bin
8514e61aa2fb0d79e6312ec9ca8e459572804b668168c0fcc62f3b7015c39c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF456 16576 bytes

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