Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd9e5108ee6051c…

MALICIOUS

PDF

70.4 KB Created: 2021-04-03 14:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 42f71c04cd9d437740e8406f3065d35c SHA-1: 3f14e260f5f036e12c42bfbfec00b29e445c284f SHA-256: dcd9e5108ee6051c2588540253f44d5993655dc8714db8fa9955049c870c592f
186 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. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/123?utm_term=oh+butterfly+song+free++masstamilan PDF link annotation
    • https://xesinuvukuwufo.weebly.com/uploads/1/3/0/7/130776104/8a60c54.pdfIn PDF document text
    • https://xajadigosulibab.weebly.com/uploads/1/3/4/6/134650053/9791009.pdfIn PDF document text
    • http://vandify.com/making_inferences_character_traits_worksheetgus2f.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/vegepexet.pdfIn PDF document text
    • https://susuwiwonilo.weebly.com/uploads/1/3/1/6/131606006/fobiburu_fuzezakekak_ravodikipe_romegilakegugem.pdfIn PDF document text
    • https://netajetuz.weebly.com/uploads/1/3/4/6/134651380/wixet.pdfIn PDF document text
    • http://podipotekoi.ru/boruto_naruto_the_movie_downloadhq4a7.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/9681856506.pdfIn PDF document text
    • https://sejexogubason.weebly.com/uploads/1/3/1/0/131070030/rujiwamedux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_6039b806902d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392220/normal_5ff1692169790.pdfIn PDF document text
    • http://003-center.ru/jabajiresulivutemazmbwgu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504839/normal_5fc5cdc074955.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/86514364697.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pirigebosagome.rf.gd/how_to_exercise_with_a_resistance_band.pdfIn PDF document text
    • http://likadekax.rf.gd/17552642535.pdfIn PDF document text
    • http://tumoxotakim.epizy.com/android_video_player_auto_resume.pdfIn PDF document text
    • http://fawikinego.myartsonline.com/tabla_de_ejercicios_abdominales_hipopresivos.pdfIn PDF document text
    • http://waraposid.rf.gd/diagnostic_research.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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 5452 bytes
SHA-256: b7c679f9d02dd3f7f53256155df7a052f76e71013ef33c4ea963f066b4ca7b79
font_01_sfnt_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 10260 bytes
SHA-256: ff2345c45fcc7e22f8029f1b21c622fd6011e5d08c2c176f07e5ad0b6a82677d

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