Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b33983e998f8556…

MALICIOUS

PDF

92.9 KB Created: 2021-07-15 15:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71b0565690cb6ef7cfd25fe5c1e4f345 SHA-1: 086796afd3d8da140db0b72df32dbc6cb398aeef SHA-256: 0b33983e998f855644f9bedba87ae84987118c8a8e59b0879c769c2b87fc30fe
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan, indicating a malicious intent. The presence of embedded URLs, although marked as benign in this analysis, suggests an attempt to redirect the user to malicious content. The PDF structure itself contains indicators of potential exploitation, as noted by the PDF_URI and PDF_DUPLICATE_OBJ_BODY_INCREMENTAL heuristics.

Machine Learning

  • Nyx PDF Classifier clean score 0.1448

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/qQn0o4eTdIQ/square?utm_term=eb1+recommendation+letter+sample+pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e94ea127127e6804173671/1625902754125/finite_element_method_lecture_notes.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed9d91881afe0f0cebe6ec/1626185105313/pdf_to_word_concertor.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_off00010b43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 16792 bytes
font_01_sfnt_off00012355.bin
4c28b3b90c563de5974aae34c90196a5d6e990f4946472fea82a0a489611ee24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 16716 bytes
font_02_sfnt_off00014e91.bin
1041a5e475d0a1fd7ba0ea9169bd614f466cd44457c3845c550d7b085cbb950f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E91 10956 bytes

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