Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99730d7eeff9e3c…

MALICIOUS

PDF

76.9 KB Created: 2021-03-10 21:36:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2b0fda1cccc1231b7d3e99bc0ad4da86 SHA-1: 4dc36d28074525f7c834cd49e054f1eb2932e99e SHA-256: b99730d7eeff9e3c20201ba71aa62761bf886a8e1611660fc31cfd61eb7343e2
186 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'Scratch 2 offline editor for pc' but is detected as malicious by ML classifiers and ClamAV. It hosts a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/123?utm_term=scratch+2+offline+editor++for+pc PDF link annotation
    • https://cdn.sqhk.co/kekotenonaxu/Dhaibgf/gutokubarolamijijuvakeb.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/9jj5gfx/secret_garden_nocturne_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/igjb1YV/emergency_contacts_template.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/dgjiehi/business_management_jobs_salary_in_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/cci6jdc/madujelepeta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410418/normal_60369f3ca67bf.pdfIn PDF document text
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/naxowe-jerotejamigawe-mopovemidalusek-bokuroj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_603336e142a43.pdfIn PDF document text
    • https://cdn.sqhk.co/mizipudi/gHOgggg/bugurikadilapisepavu.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/xjeiT5I/sajuvanol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464330/normal_601b3efbe41b5.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/bryant_plus_80_filter_replacement_size.pdfIn PDF document text
    • https://finubakexa.weebly.com/uploads/1/3/1/3/131383318/tibomu_zitutukuke.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/d12c3662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_601ecbf43ec3a.pdfIn PDF document text
    • https://vilifamizebu.weebly.com/uploads/1/3/4/6/134617150/negozowudusebijix.pdfIn PDF document text
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/dajal_pewefuvose_xanikuzifak.pdfIn PDF document text
    • http://wegoradubi.sportsontheweb.net/zaruxuxu.pdfIn PDF document text
    • https://gajarasanen.weebly.com/uploads/1/3/4/7/134714971/suvegirafexipi.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/jdShfgP/petenoval.pdfIn PDF document text
    • https://kotugelofamoxu.weebly.com/uploads/1/3/4/4/134403640/4860361.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozudil.onlinewebshop.net/latest_technology_in_computer_science_2020.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/asus_x205ta_upgrade_ssd.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_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 5300 bytes
SHA-256: 02e1a9f27e6e0aad470d70f1d6ec40fbe5d58f0ba1cbba3ce9b3aed007804f61
font_01_sfnt_off0001025e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 10300 bytes
SHA-256: 5b7939d1a355e9169ea4a86fe6c29fa047b532a6b3d9260345224fdf15f793df