Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38b06cdbe9bcaf1…

MALICIOUS

PDF

110.4 KB Created: 2021-03-20 07:14:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18e19b0593199b7d9910b31dd7892db8 SHA-1: 65a3302dd1651527944ee46de11a27d128ef386b SHA-256: e38b06cdbe9bcaf11c39410cf2c5f9014d22888454850aaeb959e889b5c183aa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains an embedded URL disguised as a link to educational notes. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple suspicious URLs, including one that appears to be a direct download link for another PDF, suggests the document is part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=refraction+of+light+class+11+notes+pdf+download
    • http://bioforcecolumbia.site/javobimezapudarufaxedajyknq1.pdf
    • https://cdn-cms.f-static.net/uploads/4425501/normal_602b029189a7c.pdf
    • https://cdn-cms.f-static.net/uploads/4453901/normal_6021a04d7d957.pdf
    • http://zabekoreju.iblogger.org/45009685669.pdf
    • http://ig-support-service.com/90954356776mithi.pdf
    • http://kotiwiwax.iblogger.org/tapebililu.pdf
    • http://nelawetazabuta.66ghz.com/fajavose.pdf
    • http://gooddevice-online.com/where_can_i_buy_cheap_chest_freezere712y.pdf
    • http://bajifepeselok.sportsontheweb.net/22766454621.pdf
    • http://takavejesutep.iblogger.org/vigazov.pdf
    • http://eroganoficial.site/63480724427js9is.pdf
    • http://fekevopimibun.sportsontheweb.net/vepumesawamabalupavu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tikofaketonub/tebowebekulise.pdf
    • http://ravizovagusemav.epizy.com/microsoft_excel_2020_training_manual.pdf
    • http://pavafisufopu.myartsonline.com/zapumojodatuku.pdf
    • https://s3.amazonaws.com/limewub/69585331816.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/los_adjetivos_demostrativos_worksheet.pdf
    • http://rowoniwetob.atwebpages.com/bojizofepexu.pdf
    • http://nokarox.rf.gd/90670115400.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://scripts.sil.org/OFL
    • 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_off0001563b.bin
81eeadaa47f561b14a4bcef540a8adb6198b918b65bcc8d097d38aa9596e4c41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1563B 5568 bytes
font_01_sfnt_off0001693e.bin
e7fb5d05d642da5ab76202dcb54f2214c703f297dbf7a257071c6d0af3516ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1693E 13240 bytes
font_02_sfnt_off00019684.bin
912810d83e1329c5b7c28468a93f9d6f76e9af1121491381c6555e9c9326e0fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19684 16128 bytes

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