Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a941a57a7ee729…

MALICIOUS

PDF

77.3 KB Created: 2021-04-03 00:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7594f09a9f2af6112d0e4e215abf7623 SHA-1: db04a6bd01d9dffcade33fd8f925608f5b521e2d SHA-256: 86a941a57a7ee7299fe85621f3833e55dc50721daa1f8e69c65c69985234d53e
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, many pointing to disposable domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious 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://druttle.ru/wix?keyword=belated+birthday+images+for+him PDF link annotation
    • http://xiguxivevov.sportsontheweb.net/acrostic_poem_rubric.pdfIn PDF document text
    • https://pasosawa.weebly.com/uploads/1/3/4/7/134737133/mepubexojiraba.pdfIn PDF document text
    • https://fivixevovisobav.weebly.com/uploads/1/3/1/3/131380347/8e700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_603a950136896.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/jirotekerorowatuzideb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486566/normal_602d47dd28e59.pdfIn PDF document text
    • https://kibasixeb.weebly.com/uploads/1/3/1/4/131438563/xavas-jamasuniremal.pdfIn PDF document text
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/7ac6d9601.pdfIn PDF document text
    • http://rakapugijumub.sportsontheweb.net/carcinoma_escamoso_de_cervix.pdfIn PDF document text
    • http://fuvisetitisenon.mypressonline.com/contemporary_sociology_theory.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392452/normal_60394fa945199.pdfIn PDF document text
    • http://pitikudefojeken.getenjoyment.net/keirsey_temperament_sorter_results.pdfIn PDF document text
    • https://kumapeforurimo.weebly.com/uploads/1/3/4/6/134664671/jutozaxe_piputal_gugitamisiduto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_604012a4659eb.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/dece2937-dd30-4374-8b35-50879679108f/tunajijugigufemubi.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/convert_to_dwg_autocad_2009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69dc701e-c15d-405f-8ea9-1f41fb0adc8d/how_to_fix_capitalism_porter.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/funcionalidad_familiar_apgar.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/aimpoint_comp_m4_alternative.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/literary_devices_list_metaphor_examples.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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 5612 bytes
SHA-256: 84b5bd8b6c76deba8c2e89cc2dc9bd84b61e218d7971d41bc1a17179e0800d77
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 10656 bytes
SHA-256: 2a0ff477449a75013fc09e36d0e666efb33523ab0b46f44dcf3e889de49ed2b1

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