Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bd37e725b381c9…

MALICIOUS

PDF

61.3 KB Created: 2020-11-20 23:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5c7c3fef8302cd8c2af30dad3a3a990d SHA-1: d772462448b84135300a61dedd2ba58d16a43330 SHA-256: b3bd37e725b381c985ade643ebd0f8a6bb3567e2659adf9339f4b51da36a08d4
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/aws?utm_term=after+action+review+form+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5fa4556fa6202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f8aaa6c2d3b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5fb7498c5403a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5f9e0f6a957d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5f94cd1087543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_5faa49584f1a5.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/zevutebulaworel/batho_pele_white_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b7fe37-d5ec-4d56-a461-f72326486b08/76781754487.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/random_theme_generator.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_off0000b5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F0 4956 bytes
SHA-256: aeb088ff6b45f1bfd9166fb30b9beb90b7e9db46b6e71b7b8081264a2c2fe1d1
font_01_sfnt_off0000c6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D2 9892 bytes
SHA-256: 8e54e2f4adade4338dab6a46dba987fa8d354bed8e52ea774bcf9037c8b4f110

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