Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffccbac532885400…

MALICIOUS

PDF

81.8 KB Created: 2021-07-16 00:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9809875af2b672d90bc22d845d2a214f SHA-1: cc670fc989d1c547d0ef63e0bb09f9000738902f SHA-256: ffccbac5328854001f56d9b728c38c79af44aefa91722b76a683edf956446df1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or malware distribution vector. The wkhtmltopdf authoring application and the structure of the PDF do not provide specific indicators for a known family, hence 'unknown family' is used.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8207

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=make+your+bed+chapter+1+summary
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e964ba025aa46e30d4df5b/1625908410699/intervention_proposal_example.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee901827fa864c7d15fb34/1626247193022/may_i_remind_you.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edca9b2799685454f6f66d/1626196635587/15715804165.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edc136d6ef6771c1d8c16b/1626194231065/the_moon_and_the_tide.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eca0807b14134336df606c/1626120321099/jonixopezirazuzododape.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec942f1951226b8b8c36db/1626117167693/noladugal.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_off0000daea.bin
eb7c6a2c2224f1f09d493564fc7cfc651e61ce8160aa80e210362273be198b6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 17188 bytes
font_01_sfnt_off0001081f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 16792 bytes
font_02_sfnt_off00012036.bin
3e5ff2289581dd3679adb4e5d12e0dc8827173c457b970dd772deb618d038d1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 11028 bytes

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