Malicious PDF — malware analysis report

Static analysis result for SHA-256 540cded8de0e02fc…

MALICIOUS

PDF

120.5 KB Created: 2021-02-08 05:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 690d8ff15fc4af8d0e08d7499a0ac9cd SHA-1: 78c37cefff87427c277138a6af88d43f3338a40c SHA-256: 540cded8de0e02fc4c4c4255ee2d2f2f8646e8aca9e4606f0255e0aae118b378
66 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://maypoin.ru/aws?utm_term=chernobyl+tv+parents+guide PDF link annotation
    • https://merejeweja.weebly.com/uploads/1/3/1/3/131381112/582295ad00.pdfIn PDF document text
    • http://karaulovlife.site/30014490801wllfh.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/zombie_forest_hd_survivaloyyy3.pdfIn PDF document text
    • http://pijitirade.iblogger.org/bunipukizibavavitir.pdfIn PDF document text
    • http://idealslimitaly.site/timakujikabetetepunokenax2iur3.pdfIn PDF document text
    • http://segway-wheelchair.ru/muzikiwigamujutuwejupihap0.pdfIn PDF document text
    • http://blognews.top/nikipepegaverunefajozax2danu.pdfIn PDF document text
    • http://trokot-tonirovka.online/crack_photozoom_775mz0.pdfIn PDF document text
    • https://wiperorapaxomun.weebly.com/uploads/1/3/5/3/135323561/853ecf20.pdfIn PDF document text
    • http://wildber.store/english_to_bengali_alphabet59qp8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorawaforase.epizy.com/windows_10_build_17134._1_iso.pdfIn PDF document text
    • http://sifebina.epizy.com/negiz.pdfIn PDF document text
    • http://delupujak.epizy.com/armitage_shanks_revit_s.pdfIn PDF document text
    • http://xixovunutev.epizy.com/hydrogen_spectral_lines.pdfIn PDF document text
    • http://senapofo.epizy.com/insulated_cladding_sheets.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_off0001860a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1860A 2972 bytes
SHA-256: 508955ceb1a861b62fccf92f840279c9a777a16d4839bfd9e630937738d47edd
font_01_sfnt_off000190b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190B3 5428 bytes
SHA-256: 198a6614974a50b0d341f301c18d3c7b014e02d9f661aead246ab705323e9f92
font_02_sfnt_off0001a31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A31A 16864 bytes
SHA-256: ecf73621f47f098647fb9f7c0176763cdb96703206de1e8156f59560a76423b1

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