Malicious PDF — malware analysis report

Static analysis result for SHA-256 b677bbdabc9941ad…

MALICIOUS

PDF

90.8 KB Created: 2021-02-14 22:47:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4f1cb1665bb6b0d6b97f8e20216f7ff2 SHA-1: abc4a18cbb09ba93c9fb432b7a774b78cad4c9c8 SHA-256: b677bbdabc9941ad797fcd01025c65639191512fc5e950700ebfdf1eec20b568
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL that directs users to a suspicious domain, likely to host phishing content or further malware. The document body, though heavily obfuscated, suggests a lure related to academic materials, consistent with phishing tactics.

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://druttle.ru/wb?keyword=netacad%20chapter%204%20answers%202018 PDF link annotation
    • http://lenudes.com/15730928770od2ru.pdfIn PDF document text
    • http://wibeminijifenu.22web.org/leleludorofepafusome.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ropuba/80261435349.pdfIn PDF document text
    • http://fekofenuxekit.rf.gd/wutijukajaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/block_party_flyer_template.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/noxukeroro.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/geket.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/hayabusa_gi_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/tuxuxixexatomusa.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/nubugenowizawiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/imperatives_worksheet_for_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/basic_electrical_engineering_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/45039406890.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 5428 bytes
SHA-256: c07e1f26b6850e509e9d1769502e7234005d3b4cce4df6cdbaa8ec9cd5c0369f
font_01_sfnt_off00012a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A76 11196 bytes
SHA-256: 565fc3c9189bdd1f659dc58a762fd0d4099c8b9ab26846551645d5d7ee75075a
font_02_sfnt_off00015090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15090 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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