Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70236400361922d…

MALICIOUS

PDF

76.3 KB Created: 2021-04-02 05:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 10e3eb2e8e42b8e6ff092b99e32416cf SHA-1: b10504dffa78389869ad00fcdd4e80f6a0dc731f SHA-256: d70236400361922d35c59d9435419ee7653c95e2f75edca889fa0fe85a91927f
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute content or phish users through these links. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware delivery attempt.

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://jacksth.ru/strik?utm_term=completing+the+square+steps+with+coefficient PDF link annotation
    • http://jedugefipevama.iblogger.org/starcraft_brood_war_battlenet.pdfIn PDF document text
    • http://technodom11.com/94282971105w5t6t.pdfIn PDF document text
    • http://daniele.store/lysistrata_playq3doe.pdfIn PDF document text
    • https://manukigobedor.weebly.com/uploads/1/3/4/4/134481395/buxixi.pdfIn PDF document text
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/jorilemumuxoxep.pdfIn PDF document text
    • https://gawotajar.weebly.com/uploads/1/3/4/5/134525297/xewinetiza.pdfIn PDF document text
    • http://copyright-help-report.com/how_to_become_diver_in_indian_navyf8nrq.pdfIn PDF document text
    • https://cdn.sqhk.co/javijaxim/gj8jhjn/how_to_make_solar_system_project_working_model.pdfIn PDF document text
    • http://karovupas.22web.org/77323641659.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/whaTPij/spy_texts_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/4hijb7b/wild_frontier_vital_prey_diet_chicken.pdfIn PDF document text
    • http://instahelpforbusiness.com/86307864644bwrll.pdfIn PDF document text
    • http://glav.info/bluestacks_ios_apps2fr76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diwifesatikebak.epizy.com/cheung_kong_infrastructure_holdings_annual_report.pdfIn PDF document text
    • http://wapuzega.rf.gd/15276821990.pdfIn PDF document text
    • http://pobipegosaba.epizy.com/best_google_data_studio_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/free_templates_html5_css3.pdfIn PDF document text
    • http://vobewegogiz.rf.gd/jufekuvarevakawatig.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/jediwejofetixeliro.pdfIn PDF document text
    • http://fevidubigozexa.rf.gd/adelphoe_terenzio_latino.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/ieee_proceedings_paper_format_guidelines.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_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 5552 bytes
SHA-256: a6b26a2f7af9258f8275f9e65124d6df3ecf353f7365585af2d3999bb68d6ce5
font_01_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 10928 bytes
SHA-256: 4f17f93d6f7de8936f3a3fd4af3ff1631cf6bcbfea080b0090c637e0078fb39a

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