Malicious PDF — malware analysis report

Static analysis result for SHA-256 54052a7db8351939…

MALICIOUS

PDF

86.9 KB Created: 2021-03-24 19:17:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6b9eb6910716351d3b0007f40bc38b5d SHA-1: 6e2e59d024ee32c7402be5108d033a5023ea4276 SHA-256: 54052a7db83519396f3e3399563195126ca21608bd67d966435b91980709db9e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=essential+communication+textbook+pdf PDF link annotation
    • http://tarezirok.mypressonline.com/create_android_app_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/J2geXgj/44671785869.pdfIn PDF document text
    • http://dotuzodozo.22web.org/kitchenaid_food_processor_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459325/normal_600cbe07a33e1.pdfIn PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/91516303555.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/ijDgfkl/gufigavagamamese.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/fjcKbie/jawapewowutetesovuvuzil.pdfIn PDF document text
    • http://tinutig.22web.org/financial_reporting_and_analysis_interview_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_6050b339e50ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487194/normal_602f448524ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_6019cdb0391f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_60143e50ca02f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guligakifiw.epizy.com/diselipefuzevomelezovakad.pdfIn PDF document text
    • http://pidexofeg.epizy.com/rotokikud.pdfIn PDF document text
    • http://tujigukaxez.rf.gd/viaje_alrededor_de_mi_craneo.pdfIn PDF document text
    • http://gowegonuma.epizy.com/pewejola.pdfIn PDF document text
    • http://vininotubosom.epizy.com/esl_reported_speech_exercises_printable.pdfIn PDF document text
    • http://fenizedotukodi.epizy.com/wasinokizetov.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 5432 bytes
SHA-256: 5af7f46f9aec0444358e4333e4c56360bee4ae28d0a83fc1c9386ebe6c0141d9
font_01_sfnt_off000129c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C7 10876 bytes
SHA-256: 4a4c06f681fddaf105e491825cdffc284b329c7f0a374ef72b5c893e6190d5f4

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