Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fedbefa3c5b998…

MALICIOUS

PDF

77.4 KB Created: 2021-07-20 05:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b54b1a733a31fe0ffc5282459df99bbc SHA-1: e4fc55e3b99e2bee67ce3869f501cfcfb81e4cbf SHA-256: 40fedbefa3c5b998adc76de9a5e87809a7206e252ed317555ccd619e097259f7
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt a password-protected archive, a common tactic to bypass gateway security. The embedded URL, while benign, points to content related to password-protected files, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7939

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/eaN1Eb74jJI/square?utm_term=how+to+make+password+protected+file+unprotected
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f5a10108ca9154dbc9010c/1626710273991/rubakabuburebe.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f2a7ae4f27972c603926ba/1626515374171/lupojosixavamuwiponikegi.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f06195c772d7746b53bd5b/1626366358221/kewuvurenudivub.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_off0000c9b9.bin
5ec54d8c0e21456196db6a80acbaa5b214a1fc7926451739d0c8cb68454e348f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 16892 bytes
font_01_sfnt_off0000f5d2.bin
4563cd5ea29ec2c55b130e547a8fe804ad7f81858eb28648609c3dc2b22ea7bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 11052 bytes
font_02_sfnt_off00010f8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 16792 bytes

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