Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5004e5f8c5b618…

MALICIOUS

PDF

84.5 KB Created: 2021-03-18 06:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2ca38030b7e633edc38d2e788f9581e6 SHA-1: d56a7bc251b61532205e2d4946eecb736959fb2f SHA-256: 2c5004e5f8c5b618f7a38131ab8a6236d1714ded1df2a2cf27c247bf19f5c9c9
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'The hound of the baskervilles chapter 7-9 summary', suggesting a lure. Numerous embedded URLs point to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier output of 0.999760 further supports the malicious classification.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=the+hound+of+the+baskervilles+chapter+7-9+summary In PDF document text
    • http://pufivuziviv.mypressonline.com/how_to_train_your_dragon_4_full_movie_in_english_2020.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/que_funcion_cumplen_las_hormonas_en_el_sistema_endocrino.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/astronomy_encyclopedia_free_download.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/dedavoninaxunozogu.pdfIn PDF document text
    • http://bakelenodizaro.iblogger.org/virginia_corporation_bylaws_template.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/cUTjbKZ/gold_rush_gold_mines_in_australia_map.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/godox_v1_user_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_60170258a0902.pdfIn PDF document text
    • http://zumufufup.sportsontheweb.net/amplificador_fender_mustang_1_v2.pdfIn PDF document text
    • https://cdn.sqhk.co/lekabewoz/gjKiciC/herpes_simplex_virus_encephalitis_treatment.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/bitcoin_menurut_islam.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/ha0sjbu/biwujerobavuforujobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_601ce05aef7a6.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/bitstream_format_xbox_one_dts_or_dolby.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dofanetanezuji.rf.gd/motamavedovupomutudigek.pdfIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/tabekexogemarawez.pdfIn PDF document text
    • http://sujunutab.atwebpages.com/marriage_certificate_affidavit_format.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 5976 bytes
SHA-256: 55bf18977d21917844017c79a6a773f0e09ed6dc3c4da63d01de115cf7f5627b
font_01_sfnt_off00011de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE4 10968 bytes
SHA-256: aee81920fdf27bcf02a3120fbca8c8d0c5dbe78f65aad423345067945d492ccf

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