Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ff8595dba4b63c…

MALICIOUS

PDF

72.9 KB Created: 2021-05-15 00:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 40cb29d7b330c71d78ba96b1f5a0e5ae SHA-1: ef8a699e489679aa7b8057dcb076c45d0acdd9c5 SHA-256: 63ff8595dba4b63cbe43a4d8b452c3796f9ab73dbb6c5f341a631fcb67aa98c8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=principles+of+ecotourism+pdf PDF link annotation
    • http://xutifufaxe.mypressonline.com/gevolalevalunowipadafof.pdfIn PDF document text
    • http://didazema.mypressonline.com/diabetes_epidemiologia_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/cjcoijb/scrap_copper_prices_today_per_pound.pdfIn PDF document text
    • https://gafonubizaragu.weebly.com/uploads/1/3/5/3/135346264/0eb7e2c979.pdfIn PDF document text
    • https://nabidojanafo.weebly.com/uploads/1/3/4/4/134455463/navudonolewaleje.pdfIn PDF document text
    • https://siwuluwavati.weebly.com/uploads/1/3/4/7/134756127/nuzokitese_xirujuwopasoj_rasowatu_vilukokaramo.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/best_acer_laptop_for_students_philippines.pdfIn PDF document text
    • http://jushq.club/66062359528l7zxx.pdfIn PDF document text
    • http://rumepado.mypressonline.com/zajulamil.pdfIn PDF document text
    • http://vegifeda.mypressonline.com/power_amp.pdfIn PDF document text
    • http://koxudizujan.mywebcommunity.org/gibajuz.pdfIn PDF document text
    • http://elerctum.org/country_of_origin_labelling_australia_style_guideilq9a.pdfIn PDF document text
    • https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/dd0559d26679709.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/GigTdNQ/switchme_multiple_accounts_apk_android.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/heZjhig/solarx_auto_insurance_salinas_ca.pdfIn PDF document text
    • https://cdn.sqhk.co/wumerelup/bibhehg/street_optical_illusions_3d_pictures.pdfIn PDF document text
    • http://hydrofthol.space/regla_de_cramer_3x3_ejercicios_resueltosddh19.pdfIn PDF document text
    • http://kitukotobov.medianewsonline.com/75369451151.pdfIn PDF document text
    • http://copyright-central-media.com/juvexosobatazokovixurofid4n9fs.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/tupofelasujewas/19512469397.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/runikikinesorajuwidesija.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/which_of_these_molecules_will_exhibit_hydrogen_bonding.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/bubble_bobble_android_theme.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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 5092 bytes
SHA-256: 33ca57752acb3330b9446769d72007877467014299472f539a03196a0461643a
font_01_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 11500 bytes
SHA-256: cb892c2be4c3614b7c8cf019990c3be62167c31bb5001ea5d42880c0251f8c01

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