Malicious PDF — malware analysis report

Static analysis result for SHA-256 d450d237ae858cfe…

MALICIOUS

PDF

80.2 KB Created: 2021-02-26 06:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b0445dddf300e91d4428c67dce2e337e SHA-1: 9db6a7c2f6bdc034715ab0acc009c765a27febf8 SHA-256: d450d237ae858cfe41a69f64c24806d30dfdaa1576624135d5ac49c498f371e0
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to be a lure related to Vygotsky's theory to entice clicks on the embedded URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=vygotsky%2527s+sociocultural+theory+examples PDF link annotation
    • https://cdn.sqhk.co/fegojujor/f3RFoDK/cash_n_go_huntsville_tx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_60355a3e0b3de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_5fe72d8f46d5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481155/normal_60083b4cd76f2.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/jepinebawo/piferelilulasufapinowasot.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/brandy_melville_locations.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/72358442423.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/bls_algorithm_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/selasupopapaj.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/sample_math_problems_for_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/90599581288.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/platformer_maker_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/12486317974.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_off0000ef6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6E 5356 bytes
SHA-256: 41a6b5ff237637c0d2e056b09b07b7ac57cececf6dd6aa3b73f4a632f5e52ea5
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 10360 bytes
SHA-256: 35cc8f869a413ce1636b39daba2896ed79c2aa9387557741b27ef01c30251362
font_02_sfnt_off00012558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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