Malicious PDF — malware analysis report

Static analysis result for SHA-256 561b117cae71587e…

MALICIOUS

PDF

80.1 KB Created: 2021-05-20 11:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e5803fdb24101a8f3ee159512e6b3133 SHA-1: 7e08c943fc1ab1558167238bbf10b50732520a8e SHA-256: 561b117cae71587ed9f4c2863e2fef6286b756ee8aa8a050dc60ac59b022e128
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, appears to be related to educational content, suggesting a lure to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/strik?utm_term=how+to+solve+a+mass+to+mass+stoichiometry+problem PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413120/normal_6068d94703cf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_6058938ce4583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_605fd8ee2e6c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492880/normal_603dfb3a572a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_6038d61e2b7b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489713/normal_5ff88b3964a51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457311/normal_5fe84e9d41530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392667/normal_5fe3ebdaf0f95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482189/normal_5ff7cc117f1e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_605614f62344c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448137/normal_5ff54c23116b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450419/normal_5fdcfa496e391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453108/normal_5fcfe6d6b5347.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492253/normal_5ffd1ff00fa00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421462/normal_605568b871294.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5fc86db420de0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485800/normal_6057e363d9ecf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530937/normal_5fda8930428cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wewiro/sqlite_studio_3._1._1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7990e8e9-db95-4188-8d0d-f7d9e5fba4f7/69776524581.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/business_plan_excel_spreadsheet_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/vuzulamazefalokugukerib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ad49614-6cf0-4a93-baba-ed82d6ab561f/wodafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1fee6d6-0916-47a6-bb5a-f84b988dde57/lesukexamo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 5528 bytes
SHA-256: 9594f0e2eef4585dd044c89e6c7c231da1a984ac0a03957669bc9d31b03e2715
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 10772 bytes
SHA-256: 13b44e08cb238147c8df6406dc3972f113b1129df85a30b0617117e9aecbf4f6

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