Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c8f888a1cd4257…

MALICIOUS

PDF

79.6 KB Created: 2021-04-07 00:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: be5847d60f3846c626a1320b869a2e46 SHA-1: a77da8143660e4cd3b68844004834b9ab3eba1e2 SHA-256: a4c8f888a1cd42578134365c83abe158615ec19c75c730838ab7481411a1f244
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier also indicated maliciousness. The embedded URL leads to a suspicious domain, likely intended to host a phishing page or further malware. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=2001+subaru+legacy+outback+common+problems PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481064/normal_5fd619b1647c4.pdfIn PDF document text
    • https://febosefukeja.weebly.com/uploads/1/3/5/3/135324858/1801745.pdfIn PDF document text
    • https://fujuzelos.weebly.com/uploads/1/3/1/3/131380065/2473636.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381297/normal_5fcca0e92315c.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/8hbBidn/81046155069.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/xigoza.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/gcjdiaM/5016340365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413228/normal_606841829fdfe.pdfIn PDF document text
    • https://fojaruzagix.weebly.com/uploads/1/3/1/3/131379198/jaxoza.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.pdfIn PDF document text
    • https://kebetesoma.weebly.com/uploads/1/3/2/6/132695457/nufakutuli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/352f2b07-3c40-414b-ad79-e99a42626057/why_uracil_in_rna_instead_of_thymine.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/zibasizolip.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/ansys_cfd_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f3db7d-7a75-4181-b0dc-4d787e65794a/30461097697.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/jolekemusuw.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/the_other_side_of_heaven_2_dvd.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/jeepers_creepers_4_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/seiko_7t62-0am0_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/dobepugovedexan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9a1d2a7-ffdf-48fc-aaba-1b7f23088cf9/que_se_necesita_para_un_credito_hipotecario_en_bancomer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a8cf1c-eff1-40c2-881f-9e1736653607/what_are_the_main_components_of_a_crm_system.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_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 5788 bytes
SHA-256: c7876573a9858de35fcbc50fad30af48f96f8b1a78cf55196165a0595028017a
font_01_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 10600 bytes
SHA-256: 5cce841b6940f35c1b5443d153bf1b9128042af61e2642dff8cdb54f186e0e28

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