Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84bb267cfe532cd…

MALICIOUS

PDF

82.8 KB Created: 2021-03-27 23:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5f0767769f1c074780020504fd5282a0 SHA-1: ec7cb16e7c5e63a131fa8e4cc65f42955d6f5db4 SHA-256: c84bb267cfe532cd39616795183dd9088a2c3919627a098fd3130595837265d4
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on disposable domains, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to malicious or deceptive 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://zajinet.ru/aws?utm_term=best+calligraphy+set+for+beginners+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371800/normal_6018844daa1fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_602164e7cb0f3.pdfIn PDF document text
    • http://slimerecipe.org/critical_thinking_skills_for_dummies_driveush6s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5ff4b5be58d7c.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/oid19jf/lokefuvan.pdfIn PDF document text
    • http://kersita.fun/cules_son_los_sacramentos_y_su_significado90emt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454429/normal_60378e9ec4be3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_602c44272f6ec.pdfIn PDF document text
    • http://youla-24.cc/how_many_pages_is_eldestjgh3j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379849/normal_60035b1593fa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385437/normal_604984f1d23e2.pdfIn PDF document text
    • http://vizionsmc.net/what_is_the_comprehensive_intervention_model_in_health_psychologyyh34i.pdfIn PDF document text
    • https://cdn.sqhk.co/gajamomol/jgjgJzT/47570702816.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/svqDicC/live_football_tv_hd_streaming_per_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5fd21921dd3fc.pdfIn PDF document text
    • http://teksalle.xyz/zetofuxeluhd4pv.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/hgegjid/90086064682.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/this_is_water_david_foster_wallace_rhetorical_analysis43rqq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ratudafoxivux.rf.gd/udl_lesson_plan_template_google_doc.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_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 5632 bytes
SHA-256: 079b1f5207d122ddbe53ba1f5f830964113920027346cf2dd4f7a2eb4253225b
font_01_sfnt_off00011bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 10160 bytes
SHA-256: 394411ba95423f6cebdf9996ebea1ab46c6dc07d9278266a58265bcfe5a42d10

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