Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e54366e09f3e56b…

MALICIOUS

PDF

78.8 KB Created: 2021-05-09 19:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a630d13ae391bc867eb933af58b49bcb SHA-1: 76ba1cce987b5b3912d7d9dc94e1561a8e4b9e87 SHA-256: 0e54366e09f3e56b5398ab9d3fa2d5a988da888d99430d78942d36e47cdfb4c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier also strongly flagged this PDF as malicious. The embedded URL and the nature of the link farm suggest an attempt to lure users to malicious sites or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xezojetit.ru/strik?utm_term=does+costco+sell+inflatable+hot+tubs
    • http://bonboxstudio.com/50266495904b7s6o.pdf
    • https://bebiluredop.weebly.com/uploads/1/3/3/9/133987060/butoporetodubu_pidefa_vikevejebi_xovabugekised.pdf
    • http://navalny.design/miami_hurricanes_football_news_bleacher_reporttk216.pdf
    • https://dosijusesuxola.weebly.com/uploads/1/3/4/3/134305349/pazazabimiken_berikakameruxot_vutofeleru.pdf
    • http://gufutaca1.xyz/hayward_goldline_aqua_plus_salt_chlorination_system887ys.pdf
    • http://thelait.pro/835013070109a7zz.pdf
    • https://dotubebiwujodej.weebly.com/uploads/1/3/4/7/134701593/3804200.pdf
    • http://nuverlites.online/7169914710bhpi3.pdf
    • http://vknart.xyz/template_exists_rails_5r5nny.pdf
    • http://instapodarok365.site/how_to_solve_cat_questions_quicklykzka6.pdf
    • http://hurricane1.space/football_manager_2015_steam_keyxsxkj.pdf
    • http://konsalting.info/63725416462w52a7.pdf
    • https://lirisosu.weebly.com/uploads/1/3/1/3/131384099/zawunoxavudawux.pdf
    • http://sberin.xyz/dapupudupudolunasezazuro0ypfn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_a67d1b3295a04a02a1ff88882eacae23.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d712aaf2-6a5b-4df4-bcf8-c76da2452112/30061213798.pdf
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_8a03d702ff984251918b9e95407f464a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bb1d2ee0-d9a2-4a5c-952b-02b7dd80cc61/ken_wilber_2020.pdf
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_8bdb94ddb2724636aed2bab380dc2678.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2a11ed7d-0e36-4cfb-bb31-bfdd68d0557a/9387541649.pdf
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_5d8ed80f36f0474c9f33212ead782e1a.pdf?index=true
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_9b4f85d130c846c390a1399483f93af5.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f68b.bin
5e68cee56de71ca736351f132d0c7e8274954e8a2444a17da6b4856ab33f674f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 5012 bytes
font_01_sfnt_off000107a0.bin
128b74751b5c096d0a732bcd911907a9eb6500cc01a43e7ea5a88f9c393163a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 11180 bytes

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