Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bbdff8811d3384…

MALICIOUS

PDF

73.0 KB Created: 2021-03-04 07:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 17640755c071f8587fc96de48ec30f58 SHA-1: e0b0fff6ab2d77ade3d5c259a34a5031ccc09be2 SHA-256: 51bbdff8811d33849dbde3174ada15145ccee52c0be11652d89a1758cb1c1dbf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=just+give+up+2+unblocked PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403141/normal_5fe2132da639b.pdfIn PDF document text
    • http://dvestideyli.xyz/actual_brayton_cycle9ye0v.pdfIn PDF document text
    • http://sdfafq.info/fikoburovimosfbyom.pdfIn PDF document text
    • http://prizinsta365.online/what_are_good_7th_grade_science_fair_projects7qwpn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_600a3c0dd89d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_602693edbba84.pdfIn PDF document text
    • http://coins24h.com/gesulonaj3jl2.pdfIn PDF document text
    • http://reduslim-official.website/27387859461qwya9.pdfIn PDF document text
    • http://burolona.22web.org/64742020483.pdfIn PDF document text
    • http://butilegoz.22web.org/lvmh_annual_report_2012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_60245e3471bdb.pdfIn PDF document text
    • https://zijolafazul.weebly.com/uploads/1/3/0/8/130873795/zivagakudo.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/hbV2ZvW/27339904903.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwesedujila/ieaqgkU/nusoluma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465907/normal_5fe2a840ce226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxuvenopojox.rf.gd/etcher_linux_mint.pdfIn PDF document text
    • http://dazimosanugep.epizy.com/bahubali_ka_gana_dj.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/outdoor_survival_knife_kit.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_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 5320 bytes
SHA-256: 1fe5848584b957921019691ba3c0ae51f7f5f739b7c9b6b51426c18a83019ec8
font_01_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 9976 bytes
SHA-256: e4a620b41bd3ec5614c15d814b2d98e1c9d3bb68b4bfae0e427c5c7d9c6b65f1

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