Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ef61671eecad2d…

MALICIOUS

PDF

78.1 KB Created: 2021-07-14 04:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e061353b1e42ecd7ac0876f800c08bd SHA-1: 75b82850df03c8c7059c9e98f4ba895d967b3637 SHA-256: 63ef61671eecad2db10c892655996a778eff7ef4a280173e7e86fc62196db002
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. The PDF contains an embedded URL that likely leads to a malicious payload, disguised as a downloadable file. No scripts were extracted, but the PDF structure and embedded URI suggest a social engineering tactic to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6407

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/y83TWYo-3DA/square?utm_term=k53+code+10+learners+test+pdf+download
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee30f0eed6cd77ab612a12/1626222832394/54249092780.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7e7747e45264421f92934/1625810804646/active_voice_and_passive_voice_in_english_grammar.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e96055e370ac63228ab0d4/1625907285941/36579264756.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e954c3fc46b1505829959e/1625904323945/14818941407.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_off0000cd14.bin
cffbbb106d29ece28f0cc05b31f1959b0ce81fbbed15f7653abf9d2205593e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD14 11080 bytes
font_01_sfnt_off0000e72b.bin
59c83ad251e65c10ffa09d64dfb751c6d5ef0248acbf23ebcba9852cbced5f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 17240 bytes
font_02_sfnt_off00011463.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 16792 bytes

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