Malicious PDF — malware analysis report

Static analysis result for SHA-256 539bc0ebcf12e32b…

MALICIOUS

PDF

79.5 KB Created: 2021-02-19 12:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6fd9aba70300ac6488a748002627973a SHA-1: 3c7fc3610bf88d9110294a4f32373f8ce864f3d8 SHA-256: 539bc0ebcf12e32beefdf9cef725b8d57e1c894e6f21b275e2cb7da9a53d4b72
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=restaurant+operations+jobs+near+me In PDF document text
    • http://ilkertr.shop/61132150997pnbvm.pdfIn PDF document text
    • https://zixaxufomomofir.weebly.com/uploads/1/3/0/7/130738537/sisurigupunoredezu.pdfIn PDF document text
    • http://kijuguwosaxo.22web.org/80404604045.pdfIn PDF document text
    • http://fullpisetc.ru/6077682240047t99.pdfIn PDF document text
    • http://oneplusonemain.xyz/46796512110yeb8m.pdfIn PDF document text
    • https://vevinobe.weebly.com/uploads/1/3/4/4/134487659/kiberoxi.pdfIn PDF document text
    • http://tonivatibiri.22web.org/befevokupokigitizararefu.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/G0ifide/xilorisudababer.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/iXjeRge/the_king_of_fighters_98_all_characters.pdfIn PDF document text
    • http://jaxuvarimirenu.22web.org/68355017027.pdfIn PDF document text
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/jijoxivekavosud.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/3999332.pdfIn PDF document text
    • http://fisutef.iblogger.org/hey_mama_variya_song_masstamilan.pdfIn PDF document text
    • http://legionmone.xyz/xuwowexetuvitowetokiwb2dvo.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/wafonix_purepili_govefusugizison_wapakimisalute.pdfIn PDF document text
    • http://manybigs.space/lesibuzupiworaxinewosm8qcm.pdfIn PDF document text
    • https://sapuzexa.weebly.com/uploads/1/3/5/3/135348006/jivizokuvudulemeva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fumexilali.rf.gd/sodumirokabozidiravifit.pdfIn PDF document text
    • http://kukosuluwab.rf.gd/guvil.pdfIn PDF document text
    • http://webemorukosor.epizy.com/kankakee_river_fishing_report_2018.pdfIn PDF document text
    • http://fukasutatota.rf.gd/xumojozosukoxekavofilibu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 5040 bytes
SHA-256: b7f01c56770bf3fd06155d296a8194c66864e542381a506adcf12234256a5c5e
font_01_sfnt_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 11420 bytes
SHA-256: 41cacdce8f33f631ef7cffd038caa70d035af0fc92cbd066ad6a7cb592ea2122
font_02_sfnt_off000122a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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