Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4df85382cfbb204…

MALICIOUS

PDF

104.1 KB Created: 2021-03-19 17:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: abe9939c377869b55019aaabf7e57288 SHA-1: a2abd1ef42753a4b781366d94443a2f1129cb06a SHA-256: f4df85382cfbb204071356ba24440b4037e3480d497fd9752a5c9537b69408ae
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of external URIs and the link farm heuristic suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gimoguvi.ru/strik?utm_term=ipad+mini+2+size PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402936/normal_6044d9215681f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_601ff7f2be4b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_60302277409a5.pdfIn PDF document text
    • http://zijafanovidiz.sportsontheweb.net/la_riqueza_de_las_naciones_resumen.pdfIn PDF document text
    • http://wtia.space/modal_verbs_exercise_pre_intermediatemy7f5.pdfIn PDF document text
    • http://euromarket.pro/60236926886zvyd5.pdfIn PDF document text
    • http://about-central.com/mutitofobivonelarulipq16.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/breathing_exercises_for_weight_loss.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/97918812826.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/45417532360.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/wefatedotajuxidewogoxenak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/igloo_ice_maker_ice108_manual.pdfIn PDF document text
    • http://zivigop.rf.gd/mecanica_vectorial_para_ingenieros_estatica_solucionario.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/acrobat_reader_dc_download.pdfIn PDF document text
    • http://wosunitiguzivef.epizy.com/womajawukumuxafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb4b840d-566d-4a8d-9758-836bf1c2dcbc/raderitepojewadiwurib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc55add-b165-4510-ba3d-e26db448b0c9/nitiku.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/cub_scouts_webelos_handbook.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/60164299987.pdfIn PDF document text
    • http://dinoxisajuz.rf.gd/kuxefosariretezatazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b463807-f5cb-4f34-8282-a35e3f45e5a3/pharmacy_tech_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a3838f-55e6-4efb-9070-7819cb3e8a86/gemebunuvawomus.pdfIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/98146665089.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001422e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422E 5096 bytes
SHA-256: 964f68dfd03b4fe8c3ebb7ac5d62956b5f535de423ac1f5aac7c6fa22bccafcb
font_01_sfnt_off0001537a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537A 12176 bytes
SHA-256: 177b35eff935ee12b9622fdfc79303656860474b517d43319aa9478908ba257a
font_02_sfnt_off00017d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D3B 16060 bytes
SHA-256: b10e7a0583bf6b216a5471aeed10f14210f1dda3adb60ac5169fcb38ba12e60c