Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3ccdff46c12429…

MALICIOUS

PDF

61.9 KB Created: 2020-11-23 15:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cfcdc86583ad9dc2005c5db4c1420a4a SHA-1: 123e7f761078babd2be88a7721538ca7ff9c8837 SHA-256: 0b3ccdff46c12429260cae4b1c187612be8e29fcc7bb224f0112f1af9dd6c364
104 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to a verification service, combined with heuristics indicating a download button lure, suggests a phishing attempt to trick users into downloading a payload. No scripts were extracted, but the overall structure and external URL point towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/wb?keyword=cbse%20marksheet%20verification%202010 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401517/normal_5f92f1bfc0008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401559/normal_5f95f5b8e1772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_5fbbaedc305c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_5fa393179e074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f87524063dc8.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/mafavuzenoliki/lowalevivofopiweramov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9168c9-9bba-4934-972c-a080444cad86/secrets_of_an_irresistible_woman.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/coulombs_law_formula_derivation.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/u_s_air_force_new_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bfaecbd-5ecc-40cf-93d2-1cf330ed922b/zilom.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/kojupudakazij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c00d7c2-2e89-40d2-b50c-687812d99743/ap_human_geography_chapter_6_religion_study_guide.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_off0000b496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB496 5584 bytes
SHA-256: 2383c53668855e843ccc922b662525e67dded5142bf062c155cd5a5906c37781
font_01_sfnt_off0000c771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 10404 bytes
SHA-256: 4712f2394e70a1d127db7f8e8c5b94e4d83656fe46e5291643e1d6d6db2845e1

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