Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b454e69c8a8bdcd…

MALICIOUS

PDF

71.6 KB Created: 2021-01-22 23:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e6701a02ed9da21cc2497b207d57c13f SHA-1: 91265a6d493a1eaa737becc3ba966ee819f28166 SHA-256: 4b454e69c8a8bdcdab18910e87c8d360b03f3fb7b289de98251f093a9dbdd0f5
226 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous external URLs embedded within its structure. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a high volume of links pointing to potentially disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic further suggests that this document may be part of a multi-stage attack, potentially providing a password to decrypt a subsequent payload. The ML classifier strongly flags this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://baarspo.ru/aws?utm_term=chichora+movie+ringtone PDF link annotation
    • https://cdn.sqhk.co/kawonidoza/8Bic8ij/formula_1_manager_game_ipad.pdfIn PDF document text
    • http://bofesota.66ghz.com/wamij.pdfIn PDF document text
    • http://monufovaxuj.66ghz.com/blythedale_children_s_hospital_annual_report.pdfIn PDF document text
    • http://waniwidolo.66ghz.com/dragon_age_jammer_s_stash_guide.pdfIn PDF document text
    • https://zerivomixiloz.weebly.com/uploads/1/3/4/6/134664353/1364509.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/vafavigad_jelumuwu_zivesevok.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/ggdVDTQ/xijujoxosinadox.pdfIn PDF document text
    • https://boxenisudima.weebly.com/uploads/1/3/2/7/132740338/8910170.pdfIn PDF document text
    • https://furujito.weebly.com/uploads/1/3/1/3/131398045/fusidonib_lagugake_gisowox.pdfIn PDF document text
    • https://palelajasirele.weebly.com/uploads/1/3/5/3/135311742/minixu.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/a7Bbiga/fazowofu.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/fuliberusadipi.pdfIn PDF document text
    • https://cdn.sqhk.co/sikereri/0geoif0/craigslist_seattle_apartments.pdfIn PDF document text
    • https://fevowavekotaxuw.weebly.com/uploads/1/3/4/6/134635114/kebinasafitik_podukibuba_vaguvu.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/fiCJjgj/best_healthy_ninja_foodi_recipes.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/vatakefojunib/ziwekigabebagepolapu.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/lavefatexo.pdfIn PDF document text
    • http://tarobajasupimi.epizy.com/weather_report_in_amritsar_next_15_days.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_off0000db30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB30 4968 bytes
SHA-256: c2bc9847c2ca3eb262bc3b3bc84a84730094d881526775ffbaa228ac6eeceebb
font_01_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 10972 bytes
SHA-256: af5d66f9fa02702082bc1067efb07bbd913155d7aa38574dd24ad424a27eb008

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