Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8e598896f16587…

MALICIOUS

PDF

76.8 KB Created: 2021-04-11 16:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 884f58c116cd4ddcb3b49ca784755e1c SHA-1: 971d09f9252e0f7109bc6d549808a2057b3bb29d SHA-256: ed8e598896f165878d0c04253ac79fcc0fdce2c694ad32ccf66d4815d57de29b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm designed for disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://nipisod.ru/strik?utm_term=plantronics+m70+not+pairing
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5fddb62ada8c6.pdf
    • http://pexulisinipev.sportsontheweb.net/52351985126.pdf
    • https://cdn-cms.f-static.net/uploads/4460048/normal_6066da94ae4a1.pdf
    • https://cdn-cms.f-static.net/uploads/4475728/normal_6047d3e780027.pdf
    • https://static.s123-cdn-static.com/uploads/4489245/normal_5ff92d0ea6e8c.pdf
    • http://dapabikokewe.iblogger.org/2011_chevy_traverse_lt_transmission_problems.pdf
    • http://bugivaf.22web.org/dusk_till_dawn_piano_sheet.pdf
    • http://lnstagramverifiedsbadgeforms.com/mudutiwuxugvpcc.pdf
    • http://razvivatel.blog/446082073550i9ab.pdf
    • https://cdn-cms.f-static.net/uploads/4422909/normal_5fe8b41276dce.pdf
    • http://foramodosug.mygamesonline.org/public_finance_management_regulations_2020_uganda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_96705b354dd742038fc6828cc61a2612.pdf?index=true
    • http://zilosazalepuzu.epizy.com/fundamentals_of_astrodynamics_and_applications_vallado.pdf
    • http://joxuritodapeni.epizy.com/86758090685.pdf
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_4174ee68cf944b6082b0a170a5b0d776.pdf?index=true
    • http://lafumiseweno.epizy.com/background_music_editor_app.pdf
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_a032c23cf19e41c4a4b7ed0d503f21c5.pdf?index=true
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_ed127723997d4df9846f3dee2a7c1651.pdf?index=true
    • http://bitagusit.epizy.com/vatafajasujijewo.pdf
    • http://muxoridevifi.epizy.com/3d_animation_software_free_for_windows.pdf
    • http://fufudaloxola.onlinewebshop.net/logical_connectives_questions_and_answers.pdf
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_23f17cfd436a4d85b54248a77f83fa7d.pdf?index=true
    • http://wawebepibalura.epizy.com/86544775522.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba9.bin
b4a90189168e235599f46a3abe3b3d02def398cbfe70ab6fbd2729b9b5bc1f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 5476 bytes
font_01_sfnt_off0000fe3b.bin
14101d80f5e3bac1f026168677cf556cb9d521cb4724c2295f07c22c3d305053		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 11588 bytes

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