Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4eee04b95039d3…

MALICIOUS

PDF

76.1 KB Created: 2021-04-06 17:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6bc5d9f2247dee62db9d670588c06c0b SHA-1: 52989c6877e74553f155e4f3d0946f0583a8bf5a SHA-256: 7d4eee04b95039d39dd17e998e41a4fb6a55097c767569833e795a261340873c
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically appearing as a search result for a common query, likely to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/strik?utm_term=how+to+cook+rice+in+a+proctor+silex+rice+cooker PDF link annotation
    • http://lefuvaguvupawax.iblogger.org/metode_argentometri.pdfIn PDF document text
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/9577126.pdfIn PDF document text
    • http://topcabinets.xyz/pathfinder_horror_adventures_trovef6oqf.pdfIn PDF document text
    • https://wikazire.weebly.com/uploads/1/3/0/9/130968935/jutalewowunakenonala.pdfIn PDF document text
    • http://tazibesemelegi.iblogger.org/ibc_container_dimensions.pdfIn PDF document text
    • http://grizhoff.ru/3959525415a6q7m.pdfIn PDF document text
    • http://mx50off.pro/how_to_program_baofeng_uv-82ca9b86.pdfIn PDF document text
    • http://kiluzilaw.sportsontheweb.net/juvigozexezaruna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejesezape.myartsonline.com/feruxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48580779-6852-4bd0-833e-1d70ee02dadf/delirarune.pdfIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_e523a5a15de84ef2af968e55099cd31c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83dcb67-f995-4a66-b7fc-df23706d022b/algorithms_in_c_robert_sedgewick_download.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/what_is_a_plaque_score.pdfIn PDF document text
    • http://lowimupedi.epizy.com/zunefixileraxine.pdfIn PDF document text
    • http://wajalapivibobi.epizy.com/auditoria_administrativa_definicion.pdfIn PDF document text
    • http://zugepoguj.onlinewebshop.net/siwefatevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53264b08-bde8-4d5f-a0f7-f09229c88637/site_reliability_engineering_salary_in_india.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_5c7bdb7afb974d1d8c29cc92db7ab49d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb870b1-4d8a-4387-a381-546f925b4bb2/62049997970.pdfIn PDF document text
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_f8588c73df524e3b8de9390f96a13ca0.pdf?index=trueIn 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_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 5112 bytes
SHA-256: 9c1a33e79a924447454f959098c35ebbc4fe2eff67f399b841c65566e2a5aa11
font_01_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 10380 bytes
SHA-256: 1b72b696afcd5998dea22cbe9f05c2cab778d6a36852acf99a8b5c7934512f91

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