Malicious PDF — malware analysis report

Static analysis result for SHA-256 f998db7746da435b…

MALICIOUS

PDF

85.6 KB Created: 2021-02-26 15:24:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0ed59cfd95b9f7d001168b5736f2561b SHA-1: 97aaea39bfe276890cad00999ba524b63dc24e20 SHA-256: f998db7746da435b74098b8ac86e895f36c8183447b6a4dd1a869fdca08c2121
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm hosted on disposable domains, aiming to redirect users to potentially harmful content. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malware distribution scheme.

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://jacksth.ru/123?utm_term=she+stoops+to+conquer+character+list PDF link annotation
    • https://muwefojiginilu.weebly.com/uploads/1/3/4/5/134512592/momenetene.pdfIn PDF document text
    • http://shoes-storie.club/knight_of_wands_health_outcome7pyun.pdfIn PDF document text
    • http://kolomata.ru/what_does_ode_mean_to_you7v7d5.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/how_to_fix_a_john_deere_riding_lawn_mower.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/how_to_clean_brother_printer_dcp-t500w.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/gfmhfjd/english_song_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/jLohbIf/futev.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/2016_buick_lacrosse_owners_manual.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/honeywell_quietcare_humidifier_filter_cleaning.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/hard_sat_reading_passages.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/22559461919.pdfIn PDF document text
    • http://hookup753.fun/dda_flat_booking_formrdjxx.pdfIn PDF document text
    • http://grigolia-studio.ru/53234811839mrep6.pdfIn PDF document text
    • https://kopepadozuko.weebly.com/uploads/1/3/4/5/134505487/544189.pdfIn PDF document text
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/vagumusuzo.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/103f51b079a.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/gsidjhH/change_background_color_in_photoshop_cc.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/g0LwLgj/79478600348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nukilaba.myartsonline.com/rilobawiwebifezokugupo.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_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 5252 bytes
SHA-256: 7d163d0413432cbce8a91863228aa7f599d01a29d665c368a200faefd0a7c035
font_01_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 12024 bytes
SHA-256: a0a787d564ce131a2070d837aba7a816b1e48b9d0dbcfeabb258c4197165c201

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