Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f68a7a0e36a7fb…

MALICIOUS

PDF

73.8 KB Created: 2021-03-25 02:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8e1716f3429bde79715591adb750dbdf SHA-1: faee12aee71c581c565205bfd267ea03d47866f9 SHA-256: 27f68a7a0e36a7fbdc1d7b1449daf9b5b14f3dbad2fbc528d061365f66687444
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it functions as a link farm on disposable hosting. The embedded URL, 'https://jottigo.ru/strik?utm_term=how+much+does+equipment+operator+make', suggests a lure related to job or salary information, a common phishing tactic. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=how+much+does+equipment+operator+make PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382617/normal_600a1881a6170.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/affairscloud_may_2020.pdfIn PDF document text
    • http://kijekidajefi.getenjoyment.net/charlotte_s_web.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/atividades_de_alfabetizao_em.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_6048d00136e2b.pdfIn PDF document text
    • http://kafidovomiguvo.mywebcommunity.org/87459610166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446270/normal_601d7058787cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5fde4e2d2d6b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499656/normal_60073591b81b5.pdfIn PDF document text
    • http://jaxifas.getenjoyment.net/scag_repair_near_me.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/77035821794.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tumasun/86634382674.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/adjective_clause_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/255b88ec-7446-479b-bb8e-0172fb53cc65/curse_of_the_azure_bonds_book.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/cyberpunk_2077_stackable_mods.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/universal_laser_systems_pls6.150d_price.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/business_itinerary_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca2ff56-1f26-4ef3-9da4-48406b807f52/how_to_change_time_on_cateye_velo_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db6cebe4-657e-43d4-920d-583dbed8d6b0/50641516735.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_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 5524 bytes
SHA-256: 8e9c2148fa731ad15f726b8f91dfd99ed1d38a18abfb3d8fda4d8051fc3d0298
font_01_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 10776 bytes
SHA-256: c63409212311dca12162a457f61d8e28531dce759b8fbbb9fff842bec6d7f271

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