Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d86b8bd8e350337…

MALICIOUS

PDF

82.9 KB Created: 2021-03-21 21:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 16d64c38ca3fb8225b5dbe24ad4556ce SHA-1: 5b040bc429210224a5c30f1a7e416a15b551542a SHA-256: 7d86b8bd8e3503374ed9b8116d753965c80f712cc64989c5a0ed06c92e348464
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with critical heuristics indicating links to known malicious redirector infrastructure and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the PDF structure and embedded links point towards an attempt to redirect the user to malicious 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=piercing+the+darkness+free+pdf In PDF document text
    • http://xijonofupawulo.mypressonline.com/corporation_bank_current_account_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_60241439b9e37.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/94740268772.pdfIn PDF document text
    • http://pojokup.getenjoyment.net/para_que_sirve_el_sulfato_de_zinc_en_nios.pdfIn PDF document text
    • http://sasawavivar.mygamesonline.org/saguzozekorajapew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462694/normal_600611d1b8469.pdfIn PDF document text
    • http://tozepimituxagus.iblogger.org/26188943523.pdfIn PDF document text
    • http://posiximuteg.sportsontheweb.net/60171151204.pdfIn PDF document text
    • http://tetoxukipim.getenjoyment.net/asean_regional_forum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_60117c94c9408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477863/normal_603a8530944b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_8a26340032774bbeabe87fca088bef0d.pdf?index=trueIn PDF document text
    • http://supajiwa.myartsonline.com/44991296114.pdfIn PDF document text
    • http://xubawebilakode.rf.gd/gujakig.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/small_business_planner.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_8dd78252a0e043f2857b941aa9a19a32.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_4f75c48c721e4ab09b1f50b6981a5d10.pdf?index=trueIn PDF document text
    • http://kunipotow.epizy.com/fanukobuw.pdfIn PDF document text
    • http://fidikaxano.myartsonline.com/11304718251.pdfIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_7ecdcab289744a68b85b4d14c61e6439.pdf?index=trueIn PDF document text
    • http://roveramo.atwebpages.com/fantastic_mr_fox_soundtrack_download.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_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 5452 bytes
SHA-256: c5a5a7fb0a4959c5f32d3c8d7d48a54dc37ab05198df82e1912555b3f5d45dfa
font_01_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 11072 bytes
SHA-256: dc5bcc89f8f3dc144a6a895dbba60565f9b3a7246cb11c5a2a6ce50ec4dddb90