Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdde068e66897a2…

MALICIOUS

PDF

70.8 KB Created: 2021-05-31 19:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e1eafc4444d21afa80c2c3310784f5b SHA-1: 19c3cbcd55abcce21d84623f888f2ff794a3c826 SHA-256: bfdde068e66897a2864c4d603ab7d3c7b5aea3bb6b03c444dbb98c7bfccc4322
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a website likely intended for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets.

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://nomylo.ru/pbw?utm_term=kinds+of+adverbs+worksheets+for+grade+6+with+answers
    • https://cdn-cms.f-static.net/uploads/4382972/normal_6027311a9fcd8.pdf
    • https://cdn-cms.f-static.net/uploads/4408712/normal_60496ee8d7d4b.pdf
    • https://cdn-cms.f-static.net/uploads/4392857/normal_6061914bf04c6.pdf
    • https://cdn-cms.f-static.net/uploads/4368466/normal_605ef1a83ce41.pdf
    • https://static.s123-cdn-static.com/uploads/4366337/normal_6003e1c0d33f2.pdf
    • https://cdn-cms.f-static.net/uploads/4443595/normal_602800aa8622c.pdf
    • https://static.s123-cdn-static.com/uploads/4483075/normal_5fce4b9f06e97.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/edde2d31-bb6b-4c6a-b81c-e770de7e888e/xesakanitazozorokejimi.pdf
    • https://uploads.strikinglycdn.com/files/a68462be-ea57-4a87-a145-cd3c949d161f/50948145258.pdf
    • https://uploads.strikinglycdn.com/files/72a36357-941e-4251-a655-b58567f4da1d/josujebelobuwumafobazu.pdf
    • https://uploads.strikinglycdn.com/files/8f1e7022-ced4-441e-bbe6-a4afc204adf3/rimexetakewotibapuwiw.pdf
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144416283/gudulafese.pdf
    • https://uploads.strikinglycdn.com/files/6e4496f0-ff89-454e-bdaa-6b32c8298c26/25429079273.pdf
    • https://uploads.strikinglycdn.com/files/1d4da48e-5cd4-476c-9654-09036f2508ac/94220333735.pdf
    • http://sejuworepow.pbworks.com/f/prentice_hall_mathematics_geometry_book_answers.pdf
    • http://xedidovetaw.pbworks.com/w/file/144411249/80446880196.pdf
    • http://gulisapil.pbworks.com/f/50022161487.pdf
    • https://uploads.strikinglycdn.com/files/5cda639c-9585-4a63-9855-fccc9699fed6/lazoxijivedunolov.pdf
    • https://uploads.strikinglycdn.com/files/dc2d30f9-7b38-44ae-9fde-f93f522d0b2a/puvujudakevatufedow.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb22.bin
ede50b2d7eb2ed56310a61b874e953afc693fe33675508969cec5e5c855695b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB22 5404 bytes
font_01_sfnt_off0000dd90.bin
84e5635a423623d16ef8d3e77dfb8214082cce08fc7a54563231f1895dd7a255		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD90 9964 bytes
font_02_sfnt_off0000ff84.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 4324 bytes

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