Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d955c2ea796c0e…

MALICIOUS

PDF

82.0 KB Created: 2021-03-17 00:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1589f84566627ec26741fa1f717a41e8 SHA-1: 21a82c38232b1ce5aa60c73be5aad7f2f5620ac2 SHA-256: 96d955c2ea796c0e7dbd93daa27a236407c955e20bf11d26ce3498d304f4c732
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it, many pointing to disposable hosting. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. While no scripts were directly extracted, the document's structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://maypoin.ru/strik?utm_term=is+s+curl+spray+good+for+natural+hair PDF link annotation
    • http://ribadubeko.scienceontheweb.net/curso_completo_de_guitarra_electrica.pdfIn PDF document text
    • https://fowerorizer.weebly.com/uploads/1/3/1/8/131856705/2dccf.pdfIn PDF document text
    • http://rolorutebu.sportsontheweb.net/aviation_industry_report.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/is_stock_market_open_on_veterans_day.pdfIn PDF document text
    • http://tazasimeli.22web.org/xozisijeronipod.pdfIn PDF document text
    • https://mitumeme.weebly.com/uploads/1/3/4/8/134879381/0066088.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/tobemulafuzebilumija.pdfIn PDF document text
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/fotuzik_pezefabawowim_nitowed_suviro.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/kugupemur.pdfIn PDF document text
    • http://ribadubeko.scienceonIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_47b28bf2c6a343a18123f287ccc908ec.pdf?index=trueIn PDF document text
    • https://1a413096-4115-453c-84a6-e19f3d0a1e7a.filesusr.com/ugd/4a2d03_a56554e4b83e4ef5a9ec251863efde79.pdf?index=trueIn PDF document text
    • http://jufabopijogik.rf.gd/midas_trend_planos.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/lsa_international_internships.pdfIn PDF document text
    • http://vomelokupav.rf.gd/wixugapepi.pdfIn PDF document text
    • http://vabizofolimise.epizy.com/62094779675.pdfIn PDF document text
    • http://zebekebagen.epizy.com/didepupirapudijorivapix.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_a33a6b865e134e4cab19cc0f324db71b.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_407d1a36bb0b4dada4aad9ed027225fa.pdf?index=trueIn PDF document text
    • https://4cc3fa2b-9cac-40d7-9435-014ba3b6b1c0.filesusr.com/ugd/c4dbd3_94d0b6e0e0674668963fcf9e54ee17b3.pdf?index=trueIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_f78ca7899a2545f9aa47e95aa7acfc86.pdf?index=trueIn PDF document text
    • http://xojasupolovoga.rf.gd/1458878349.pdfIn PDF document text
    • http://xajejosiwoja.epizy.com/kanepudojujowafogelowuvik.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_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 5456 bytes
SHA-256: 044225817a9b4ab7e01686e3611e5968a896d88d44402e1625ea62a16b9eef20
font_01_sfnt_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 10240 bytes
SHA-256: 651039e43aa1ffb673fa541358a81bab8cc4b1b4318dd9e85bc0d491aa3b6b34

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