Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04a5159b886df1f…

MALICIOUS

PDF

78.8 KB Created: 2021-05-15 08:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: efbe2188312ee69c83b72c28762c7b91 SHA-1: 56fa6808f59c3637ed171c06cc88aa586258abd3 SHA-256: b04a5159b886df1fab4f0e00a67d46f1d9f4ac1d2f556dfdc023f5be5e6ccb4a
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used for SEO poisoning and directing users to potentially 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://kuzutuzo.ru/wb?keyword=is%20salt%20dissolving%20in%20water%20a%20physical%20or%20chemical%20property PDF link annotation
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/2372366.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/79571337501.pdfIn PDF document text
    • https://walabawasuris.weebly.com/uploads/1/3/4/2/134265347/jowutikewoga.pdfIn PDF document text
    • http://rotirir.mypressonline.com/71029082358.pdfIn PDF document text
    • http://dejukanagalu.22web.org/zanig.pdfIn PDF document text
    • http://priz24.site/49308211541w33cy.pdfIn PDF document text
    • http://igclienteam.com/444912877005gq1l.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/jerogud.pdfIn PDF document text
    • http://securityverifiedservices.com/zowusogusipvylyy.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/20437350997.pdfIn PDF document text
    • http://xuzobinemipivor.mygamesonline.org/78013746348.pdfIn PDF document text
    • http://mokaxizekebade.scienceontheweb.net/pere_lachaise_cemetery_map.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/malibu_transformer_photocell_replacement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://susabumo.atwebpages.com/70043972251.pdfIn PDF document text
    • http://vakewexapenox.epizy.com/sejofulogusef.pdfIn PDF document text
    • http://fusikisedote.epizy.com/verona_italy_map.pdfIn PDF document text
    • http://lanurifif.rf.gd/xumexazepifuxarot.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/niv_study_bible_fully_revised_edition_personal_size.pdfIn PDF document text
    • http://nijarigu.onlinewebshop.net/horno_de_grafito_absorcion_atomica.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_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 5676 bytes
SHA-256: c8f0da91cba692d995faf40a4929b9b7f4c14a8788cd35af343d9ef77b9cbdc4
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 11296 bytes
SHA-256: d7bbb1f15c9d6cef2974fe1fee57f66fc367fc8b26eb402b26a98506a1fe2bd3

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