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)
MD5: 2ca38030b7e633edc38d2e788f9581e6 SHA-1: d56a7bc251b61532205e2d4946eecb736959fb2f SHA-256: 2c5004e5f8c5b618f7a38131ab8a6236d1714ded1df2a2cf27c247bf19f5c9c9
126 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, and contains numerous embedded URLs pointing to disposable domains. The document body, though truncated, suggests a lure related to 'The hound of the baskervilles chapter 7-9 summary', likely to disguise the malicious intent of directing users to potentially harmful websites.

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://dafemum.ru/strik?utm_term=the+hound+of+the+baskervilles+chapter+7-9+summary
    • http://pufivuziviv.mypressonline.com/how_to_train_your_dragon_4_full_movie_in_english_2020.pdf
    • http://pimifawimonidij.mywebcommunity.org/que_funcion_cumplen_las_hormonas_en_el_sistema_endocrino.pdf
    • http://rijebipimaba.getenjoyment.net/astronomy_encyclopedia_free_download.pdf
    • http://moxawunanenubop.sportsontheweb.net/dedavoninaxunozogu.pdf
    • http://bakelenodizaro.iblogger.org/virginia_corporation_bylaws_template.pdf
    • https://cdn.sqhk.co/dafibuxoki/cUTjbKZ/gold_rush_gold_mines_in_australia_map.pdf
    • https://cdn-cms.f-static.net/uploads/4418984/normal_60170258a0902.pdf
    • http://zumufufup.sportsontheweb.net/amplificador_fender_mustang_1_v2.pdf
    • https://cdn.sqhk.co/lekabewoz/gjKiciC/herpes_simplex_virus_encephalitis_treatment.pdf
    • http://deladinabixek.sportsontheweb.net/bitcoin_menurut_islam.pdf
    • https://cdn.sqhk.co/kepilujofeje/ha0sjbu/biwujerobavuforujobe.pdf
    • https://cdn-cms.f-static.net/uploads/4386621/normal_601ce05aef7a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dofanetanezuji.rf.gd/motamavedovupomutudigek.pdf
    • https://s3.amazonaws.com/laginekux/godox_v1_user_guide.pdf
    • http://tiwosutodegadax.onlinewebshop.net/tabekexogemarawez.pdf
    • http://sujunutab.atwebpages.com/marriage_certificate_affidavit_format.pdf
    • https://s3.amazonaws.com/mubefula/bitstream_format_xbox_one_dts_or_dolby.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

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

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