Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eff45ebea89f6ea…

MALICIOUS

PDF

74.2 KB Created: 2021-02-28 23:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: abb38bc559cc50deb84b205ecdc9630f SHA-1: a5b0c1a5e22fe6d0aaa5c4529240393189574eee SHA-256: 6eff45ebea89f6ea0ace9de4f3d6e59331ec5e854e90fd8b5f073ed8251c66cd
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure point towards an initial access vector via spearphishing attachment.

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
  • 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://zajinet.ru/123?utm_term=john+deere+hydro+175+mower+deck+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380681/normal_600b6b768a5d1.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/44855568103.pdfIn PDF document text
    • http://koolmaxt.online/51893037791qgxll.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_601fc1ac4e4e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_60242d5388eaf.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/iehcJhf/98563993814.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/hiigu3d/carb_free_banana_pancake_recipe.pdfIn PDF document text
    • http://vittorguxx.site/what_is_the_difference_between_ti_ba_ii_plus_and_professionalzubg9.pdfIn PDF document text
    • http://ributufukepun.66ghz.com/pudiwijakurofikuroxokaj.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/why_isnt_my_aux_cord_working_in_my_car.pdfIn PDF document text
    • http://gakofanotizukab.22web.org/379216157.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/j1xjalN/lyrica_anderson_baby_pics.pdfIn PDF document text
    • http://comp-arenda.site/colegio_de_profesionales_de_enfermeria_de_puerto_rico_codigo_de_etican406t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_602c95873832b.pdfIn PDF document text
    • http://life50it.pro/application_form_korean_embassy5swz6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sunuwib.epizy.com/boss_2_movie_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/ketapili.pdfIn PDF document text
    • http://vetiluxakosimut.epizy.com/bizunutunepatafonaladoke.pdfIn PDF document text
    • http://didajuna.rf.gd/jitaxawasesuguliri.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/17736932796.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_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 5644 bytes
SHA-256: be20141003c83d16d3bb2ef34f4f76dba6105dbc852907295c02cd8053c149d3
font_01_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 10088 bytes
SHA-256: 193d72e28bce3ac0395bba0380340bfd422a7ab6d4b93848a3da5cbc89b0d164

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