Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c4c53c903565e6…

MALICIOUS

PDF

82.2 KB Created: 2021-07-12 22:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 933b7b44f72c704cb4b7ce915bd07fbc SHA-1: a6a531a8c9e91a08e76fc4d12e22dd960e64900f SHA-256: c3c4c53c903565e6c7f14a170560b4e33855ec1e75aadd0862de2958c9f08bb9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an embedded URL, even if currently benign, suggests an attempt to redirect users. The PDF structure and heuristic firings point towards a phishing or trojan delivery mechanism, consistent with the 'Pdf.Phishing.Trojan' ClamAV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/cEZ-xJcQpFE/square?utm_term=birthday+wishes+for+lover+in+tamil+kavithai
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec9569cd1a1204f6c9a94c/1626117481553/15315132513.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e87d50c089c1459a16a6dd/1625849168680/dojusexo.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7f15cc97682122423c9b/1626111765397/fazutasugigedululibute.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e94b0892abcc18c4f76309/1625901832558/great_companies_to_work_for.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec94eff83a7f26ecd20588/1626117359289/growing_tibouchina_in_pots.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8e36ab673687559648611/1625875306730/2365659323.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8cf26b166174ac2d6a216/1625870118768/weightlifting_comparison_chart.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8d1e7efa1bb2f50749784/1625870823175/dr_faustus_act_1_scene_3.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e900382dabf2723552e6f1/1625882680577/vabijedixidanozebud.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e953c2f4fe78435a3c32bc/1625904066300/how_to_combine_files_on_windows_7.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e79aec8592fe3a588de782/1625791213047/lenezelub.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7b06c95719b356d908a2a/1625796717031/butter_churn_music_visualizer.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec706fa1f8f93f64a9fefb/1626108015728/gobura.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_off0000dd04.bin
eda2ca86cd6590b91d2d6d81eefb443981604a2ef27461f7011dfb490a48f58a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 17912 bytes
font_01_sfnt_off00010ab6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 16792 bytes
font_02_sfnt_off000122cd.bin
d48a3f4cc1a6cb42040f2a99ca5c85aa09c5931d2c2d223c7f7e4c54cc8b4926		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 11032 bytes

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