Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc813e4ddca0039…

MALICIOUS

PDF

76.0 KB Created: 2021-03-10 06:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 03f365104aaef6cb00b652870ca10976 SHA-1: eb1aaaba4380febc0e33ce6b91c5d7ebb929614c SHA-256: 9dc813e4ddca003921aa9e05ddec78b52f61d41d3c8b6354c38c092fcd22638c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful 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://baarspo.ru/award?keyword=akhnaton+agatha+christie+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450730/normal_5fc8fac820b3d.pdfIn PDF document text
    • https://cdn.sqhk.co/pomiwuximu/Vgeigge/dig_deep_meaning_urban_dictionary.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/the_compound_effect_darren_hardy_quotesfa7m0.pdfIn PDF document text
    • http://infonewstravel.com/ham_radio_general_study_guideks4vg.pdfIn PDF document text
    • https://cdn.sqhk.co/mojuzizimu/ikuojif/download_labyrinth_of_the_witch_mod.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/31048377972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389384/normal_5fd055b649ba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_5fe9cf093fe7f.pdfIn PDF document text
    • http://hhizmet.com/279224219330twoh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5fd19dc729b81.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/semuvus.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/nisexadogiripopopajer.pdfIn PDF document text
    • https://cdn.sqhk.co/giwibilawa/jbMmiaV/infectious_definition_biology.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/hihjKUj/water_splash_pad_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/ahajegd/72213819241.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lukafimagog.atwebpages.com/it_book_chapter_3_summary.pdfIn PDF document text
    • http://bamonoxo.onlinewebshop.net/origami_lut_free_download.pdfIn PDF document text
    • http://duxepivol.myartsonline.com/movie_maker_app_free_android.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/.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_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 5440 bytes
SHA-256: af702118d4af1a441482d02cc3afb5402f37b3e93eb2eb1da419c297dca7d85e
font_01_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 11792 bytes
SHA-256: f13dc13ca5981ccfecb1e325869dbc676610f70e0ca053c079fe11799006e9a5

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