Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcede3c325d476c…

MALICIOUS

PDF

87.5 KB Created: 2021-04-28 22:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 83383dfa65c8e6b6badde86e00e23f40 SHA-1: c3670e969f9d9e25a0d54ba2f271fc4c82f1c6d2 SHA-256: 0dcede3c325d476cb2e58a4a6e04713a2c7ccac8cf236aaca5450388237b60a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nipisod.ru/strik?utm_term=beatles+songbook+piano+guitar PDF link annotation
    • http://sentytld.online/62910973072fqnif.pdfIn PDF document text
    • http://xadexawufomovi.sportsontheweb.net/92712362668.pdfIn PDF document text
    • http://vseti.life/real_madrid_vs_bayern_highlights_2018mwv4k.pdfIn PDF document text
    • http://piwubexugapi.22web.org/22726774305.pdfIn PDF document text
    • http://salet.store/how_to_draw_realistic_lips_beginnerspckjy.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/bikisegerelozorukob.pdfIn PDF document text
    • http://gefokugok.getenjoyment.net/goxaganexetuv.pdfIn PDF document text
    • http://greatmasters.biz/the_secret_life_of_plants_movie_netflixx32k5.pdfIn PDF document text
    • http://agreevudb.rest/somupusomagaghy5pn.pdfIn PDF document text
    • http://sivolejujivozul.scienceontheweb.net/gazeromojenabafoboveta.pdfIn PDF document text
    • http://cabinetsly.xyz/70208463968w4z39.pdfIn PDF document text
    • http://argo-tourism.com/redimebuwurinak2jl9x.pdfIn PDF document text
    • http://gudutisiluzew.mypressonline.com/25738541345.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://durunorutap.epizy.com/best_website_to_marathi_movies_free.pdfIn PDF document text
    • http://fegoluvarelewum.myartsonline.com/basic_computer_general_knowledge_questions_and_answers.pdfIn PDF document text
    • http://kakoxoduruze.epizy.com/hindu_marriage_biodata_format_download.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/kaworadonovedevexunugale.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_997a652871fb4f39b43a63f7556a67c1.pdf?index=trueIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_b6bf0eefc53144b081aba870ca44018e.pdf?index=trueIn 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_off0001187d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187D 5240 bytes
SHA-256: 66e38ad4b7f5b8d9cd1ac272354ea9a2660bd0c8d7b4a6992585e91afc1a546e
font_01_sfnt_off00012a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5C 11220 bytes
SHA-256: 19fcc449a77b346da97873ef5a4a5939680bb3bf367ea744220a11fb7b3fd784