Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7d1f417f3e8d57…

MALICIOUS

PDF

173.9 KB Created: 2021-03-14 07:20:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5cf0c1b3008f8f10565a7ddb6444a808 SHA-1: d476f3885ac1b828bbbe6a46ba1157c542358b03 SHA-256: 4f7d1f417f3e8d57f066a44e858aef202e592268fe7b1ab1106ecc1863ae1c7d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious content.

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://pelibifir.ru/wix?keyword=pembroke+elementary+school+ky PDF link annotation
    • http://gezudozu.iblogger.org/samsung_rf267aers_ice_maker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5fe7a9c47d4d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408878/normal_600c38cc9b464.pdfIn PDF document text
    • http://barodowo.iblogger.org/6205418217.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dominomufu.rf.gd/xujaji.pdfIn PDF document text
    • http://gixopesibesuges.epizy.com/ahs_cult_parents_guide.pdfIn PDF document text
    • http://ridabus.epizy.com/biocalculus_calculus_probability_and_statistics_for_the_life_sciences_free.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/wuseximokuw.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/taobao_apk_2018.pdfIn PDF document text
    • http://nijufunirel.rf.gd/advantages_of_dbms_over_traditional_file_system.pdfIn PDF document text
    • http://wizuzipureja.epizy.com/7809242454.pdfIn PDF document text
    • http://wevedikelu.epizy.com/community_service_log_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/roruxuxurebirifiwifesin.pdfIn PDF document text
    • http://wudazebej.atwebpages.com/what_are_the_objectives_of_performance_appraisal.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/princeton_academic_calendar.pdfIn PDF document text
    • http://kitomov.epizy.com/us_attorneys_office_sdny_internship.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_off00027268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27268 5348 bytes
SHA-256: 28b4f4e94db45f2ffe0d1a127315b3685777fac64788f55c843dca13d17161f6
font_01_sfnt_off0002846f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2846F 11164 bytes
SHA-256: a6dce48eb7247dbfa97c6630cbb5186a120cee021746729b1aca6d64eec35272

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