Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cacf47856142494…

MALICIOUS

PDF

69.4 KB Created: 2021-05-13 00:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5ae171ff33f625379cc4b09bf0cbb45e SHA-1: 02d686186c51521619452b8735405531a40abc23 SHA-256: 3cacf47856142494df2c2d87cc0c4d527b4a82f597f88b5be07e5aef2e187883
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it functions as a link farm on disposable hosting, designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=briggs+and+stratton+engine+oil+sds PDF link annotation
    • http://gexopidikimo.mygamesonline.org/47052099422.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425909/normal_5ff2772f0ec9a.pdfIn PDF document text
    • http://wudenufodoroziv.scienceontheweb.net/list_of_important_days_in.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/2461936972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410443/normal_604ae97dd1b87.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/jurud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_60304fadc4943.pdfIn PDF document text
    • http://suwefazimim.medianewsonline.com/bugubuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_602f5b76ded02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388063/normal_6026fa794216f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujupifirafadus.myartsonline.com/35288243523.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/bottin_mondain.pdfIn PDF document text
    • http://wazeniwemir.onlinewebshop.net/pavivoboregub.pdfIn PDF document text
    • http://vulopekusape.atwebpages.com/99387078711.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/masterbuilt_electric_smoker_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0da374-258e-42fe-ae5f-e38d7fd9ec51/can_a_mechanical_engineer_become_a_systems_engineer.pdfIn PDF document text
    • http://pigutun.myartsonline.com/4721586787.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/how_to_reset_my_voicemail_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd97748-9335-403e-a796-08ebe10b1bac/is_developmental_delay_curable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/617029ad-057c-4ae0-b9fc-0ee843752622/pokemon_x_and_y_guide_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd3f642-8b7a-48f7-a42d-b65bf99a03f0/graphic_design_portfolio_examples_for_college.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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 5044 bytes
SHA-256: 7119f47736e4779c427422a4ce3b27bc853ee0bd2a6b38fa80810eee6a4964d0
font_01_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 10224 bytes
SHA-256: bf0b5cd48afa432a421a36940c079078caf4d8cdfde1631dba463a438422f58b

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