Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d8f0b80ca81a22…

MALICIOUS

PDF

77.1 KB Created: 2021-04-09 01:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bf7595e7a65d74e8068f5b6e34baea20 SHA-1: 277d57c84b69f11a95fcb36388b2c857323d4b41 SHA-256: b2d8f0b80ca81a226d9fbc0767adc3ee5672149ede11e36f110734435ad12eba
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document that contains an embedded URL and a visual call-to-action button, strongly suggesting a phishing attempt to trick the user into downloading a payload. ClamAV detection and ML classification confirm its malicious nature. The primary IOC is the external URI found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=soccer+strength+and+conditioning+workouts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479462/normal_6017d6332c486.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383156/normal_5fcca90c513fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383698/normal_6005969439bd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5ffc0e16deb1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475995/normal_5fd0f82a1ce0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491688/normal_605f713f5449f.pdfIn PDF document text
    • https://cdn.sqhk.co/vudebalox/iHjjhgf/pentimento_definition_poetry.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/4iewsib/58030453663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489237/normal_5fd12d2f77d7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454670/normal_5fe05264ba1d4.pdfIn PDF document text
    • https://cdn.sqhk.co/wefopijupe/bIAjbIs/above_sky_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_604ff92684458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412388/normal_5ffad9b24caad.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/xafaxotaful/24242331378.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/connect_samsung_tv_remote_to_vizio_sound_bar.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/37704577184.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/emission_spectra_and_energy_levels_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/zipuxajaradiruruvotope.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/gonobopogu.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/41636813539.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_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 5428 bytes
SHA-256: aa00a29864e3be521bc1a8de7f7f1004204e2a90963a904d2349e4102f60d74a
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 11588 bytes
SHA-256: b370bfd649ce38f55784329e743df52c56c0cb3dc1b96f162bcb4327c9516218

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