Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8ae131547c67b1…

MALICIOUS

PDF

70.2 KB Created: 2021-04-02 02:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4e3fd0ae08913be315a71dcae7a6e1b0 SHA-1: 2a2e669215620e4ead18933c2a12f6df0df11ac5 SHA-256: 4d8ae131547c67b1a81b23d3c99947d187fc1f87725e6b8be2721e95706a9bef
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model also indicated maliciousness. The document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly indicate a phishing attempt or a lure to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=algebra+1+resource+book+pdf PDF link annotation
    • http://xenuponominabek.iblogger.org/jofekobedakejenabuzofev.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/janodukipitisatipenuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463552/normal_603fd5db35cdb.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/presentation_templates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_605d5b6100c26.pdfIn PDF document text
    • https://pimanubidaw.weebly.com/uploads/1/3/4/3/134353005/dozetabip.pdfIn PDF document text
    • https://jobuvurivoko.weebly.com/uploads/1/3/2/6/132681743/jazexeperorumagosuva.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/8edecb7dc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478926/normal_600da426909e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_602d39f418998.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fec8343d504b.pdfIn PDF document text
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/kigoboga.pdfIn PDF document text
    • https://xuwowazasoko.weebly.com/uploads/1/3/4/0/134041707/3696331.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tadidej.rf.gd/reekie_architectural_drawing.pdfIn PDF document text
    • http://bamemuwibe.epizy.com/qasidah_imam_busiri.pdfIn PDF document text
    • http://kitilogokufalu.atwebpages.com/xuxewubifabaferiwosufuro.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_e8aaff582fbc4c57a1ff2d347a72e87e.pdf?index=trueIn PDF document text
    • http://busimutu.epizy.com/continuous_deployment_assessment_questions_and_answers.pdfIn PDF document text
    • http://lipajivi.epizy.com/female_christian_names_and_their_meaning.pdfIn PDF document text
    • http://nivomijerunaz.epizy.com/mitifafopemi.pdfIn PDF document text
    • http://wesamejoz.epizy.com/the_anatomy_of_fascism_wikipedia.pdfIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_69106b60b85845578bd6fa30d410bfd8.pdf?index=trueIn PDF document text
    • http://toponetivipabar.rf.gd/alliance_residential_performance_manager_salary.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_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 5568 bytes
SHA-256: 356eb0fbd2d1330815c3b95645932a13d4afc8145f0d5c3ffc2313cf7565921c
font_01_sfnt_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 10716 bytes
SHA-256: 5c6f0749d4fe6bb3e63e5e729c8d6fce8fb14a16fbe610a0f5dbc91a89e17607

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