Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04b9d621009d9e7…

MALICIOUS

PDF

79.8 KB Created: 2021-04-03 13:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1463a846215e9dbee66cc4824a6f0c65 SHA-1: d7cea17459d5976c62e044d66673af6ca74a9ce5 SHA-256: b04b9d621009d9e734ef865e37ab37febf3f4252de72e0962fd7db4f81cd3430
126 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure itself is weaponized to redirect users to potentially harmful sites.

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://kuzutuzo.ru/strik?utm_term=who+sings+for+simba+in+the+lion+king+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489244/normal_604035778a58d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_603d6d3a84a36.pdfIn PDF document text
    • http://luzupogakij.sportsontheweb.net/adrenal_tumors.pdfIn PDF document text
    • http://gixuvexadagurux.22web.org/52468619686.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426957/normal_5fc878b27d2f8.pdfIn PDF document text
    • http://sabumow.mygamesonline.org/xumukebam.pdfIn PDF document text
    • http://kazedoruredupe.22web.org/algebra_worksheets_6th_grade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409420/normal_5ffd1de4a76d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417023/normal_6031bdf340923.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/bubuximorajamivabo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tigisatobenuwi.epizy.com/95878773931.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/95085290940.pdfIn PDF document text
    • http://zebinagapovu.epizy.com/boom_beach_apk_apkpure.pdfIn PDF document text
    • http://merapenerabari.myartsonline.com/calendario_serie_a_2020_19_gazzetta.pdfIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_c7d10e0e8cdb43f3a3d74f180f7b2cd7.pdf?index=trueIn PDF document text
    • http://vekisofekibote.myartsonline.com/alexander_nevsky_prokofiev.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/jerilazemapakabepote.pdfIn PDF document text
    • http://fudewalazakukug.epizy.com/76740619552.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_480103dfa8474af5bf4c5ce35a4b2223.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/infinity_pool_design_guidelines.pdfIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_2d8283d419a748d59be0b167456390e7.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_9f35a517b787479f80c089abfa2eb5c8.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_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 5880 bytes
SHA-256: f701b890cfc639fc15d166aaaf398c4ea0df073feb1b143436b79d395cc9b5b9
font_01_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 11032 bytes
SHA-256: cf8d2216e864b7ec1d90666d0235adf5ee5c282adad2d72bb2ece07a76d764c4

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