Malicious PDF — malware analysis report

Static analysis result for SHA-256 757988a352f9dad4…

MALICIOUS

PDF

90.0 KB Created: 2021-02-27 11:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 28566976bd242875cef25dec30b40434 SHA-1: 425eeb1098f5bf29f1bd3232eefdcc2efb8736b3 SHA-256: 757988a352f9dad49b73ce979cc998b0e009870f6370fdaffad8ee61e220e692
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent URL pointing to 'mezovuduw.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded links are consistent with a spearphishing attachment used to redirect users to malicious sites.

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://mezovuduw.ru/strik?utm_term=%25D0%25BF%25D0%25BE%25D1%2587%25D0%25B5%25D0%25BC%25D1%2583+%25D1%2584%25D1%2580%25D0%25B0%25D0%25BD%25D1%2586%25D1%2583%25D0%25B7%25D1%2581%25D0%25BA%25D0%25B8%25D0%25B5+%25D0%25B4%25D0%25B5%25D1%2582%25D0%25B8+%25D0%25BD%25D0%25B5+%25D0%25BF%25D0%25BB%25D1%258E%25D1%258E%25D1%2582%25D1%2581%25D1%258F+%25D0%25B5%25D0%25B4%25D0%25BE%25D0%25B9+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485823/normal_5fe6fa9553133.pdfIn PDF document text
    • http://xuputunoxukir.22web.org/rajedafajoma.pdfIn PDF document text
    • http://vepekideku.iblogger.org/gufotomokaruwozuzi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suraweko.epizy.com/excel_vba_search_all_sheets.pdfIn PDF document text
    • http://mizadebep.rf.gd/lodajinogenu.pdfIn PDF document text
    • http://xafuzapojumir.rf.gd/sea_of_monsters_summary_chapter_1.pdfIn PDF document text
    • http://zasidad.epizy.com/38688231601.pdfIn PDF document text
    • http://gimuluma.epizy.com/xovegakazofizujujumanegum.pdfIn PDF document text
    • http://deniketeza.rf.gd/17925560810.pdfIn PDF document text
    • http://dagogedimin.rf.gd/tamil_movie_kaththi_full_film_free.pdfIn PDF document text
    • http://betesemimototi.rf.gd/zibobuvijad.pdfIn PDF document text
    • http://vujipuxi.epizy.com/florida_used_car_bill_of_sale_form.pdfIn PDF document text
    • http://dufatiji.rf.gd/lidav.pdfIn PDF document text
    • http://zukopeziwegufu.epizy.com/best_book_for_fluid_mechanics_for_gate_quora.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_off00011141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11141 6696 bytes
SHA-256: 2d07a53723850871e94014950061f2ca79d5c2ced92dfeb8d6149186f9767c98
font_01_sfnt_off00012709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12709 15632 bytes
SHA-256: 3f44b413ad7cc93a0afc2cd52c14e90b28e87ab57efec47fc6ae4cd5e99ef02d

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