Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b440f938845c63…

MALICIOUS

PDF

74.3 KB Created: 2021-03-16 17:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb3f992d0028d4602cb66ee1f6bea9f8 SHA-1: 79206caf136dc49ae91ca3f6db919d929f311f82 SHA-256: b6b440f938845c63d5062c9d048b040de78e51f49cf00da9a328d5f8583c9bfd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/123?utm_term=tri+fold+brochure+template+illustrator+free
    • http://anarchymedya.com/roomba_550_partsdwn2l.pdf
    • http://afracheat1.xyz/hotstar_app_tv_showvg8wd.pdf
    • http://mimisijuz.mypressonline.com/can_t_hurt_me_download_free.pdf
    • http://visunuduxat.mypressonline.com/a_monster_calls_book.pdf
    • http://mosasekoz.22web.org/estrategias_de_bsqueda_de_empleo.pdf
    • http://robot3.site/munowikoxifupuvtwy8.pdf
    • http://instapriz24.site/html5_address_book_templaterrwyy.pdf
    • http://rikopevadibix.iblogger.org/satibu.pdf
    • http://vizeduj.iblogger.org/73910016568.pdf
    • http://vawuzusodiguse.iblogger.org/guidelime_horde_guide.pdf
    • http://kupimaxi.sportsontheweb.net/sugudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dijuvunote.onlinewebshop.net/agreement_on_the_application_of_sanitary_and_phytosanitary_measures.pdf
    • http://fojamemu.epizy.com/bangla_book_islamic.pdf
    • https://uploads.strikinglycdn.com/files/522c2d2d-a7f2-4a96-b4be-7e535062677a/tigopokitizofupibotusope.pdf
    • https://s3.amazonaws.com/roxawo/why_is_my_bosch_oven_not_heating_up.pdf
    • https://uploads.strikinglycdn.com/files/d7fbe030-f771-4255-a5d6-7326e174ebaf/58715270535.pdf
    • https://s3.amazonaws.com/sebunuzu/bolide_slideshow_creator.pdf
    • http://xogegusubo.rf.gd/90073753137.pdf
    • http://xuzatazuji.epizy.com/calendar_2020_cute.pdf
    • https://s3.amazonaws.com/julaxel/blackmart_alpha_indir_apk.pdf
    • https://uploads.strikinglycdn.com/files/adaeb370-b8a6-40ea-b3d8-6864456fc62d/portable_dvd_player_for_car.pdf
    • http://dugoneluxokudu.rf.gd/25352124402.pdf
    • http://dupumimegijema.epizy.com/what_does_a_dog_temperament_test_consist_of.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_off0000e53c.bin
b29ad0e8453843c438d7916617e10721edae9896c93eed0994a5d5955b7f9f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 5484 bytes
font_01_sfnt_off0000f7a9.bin
a0d8b1d502e409200bed2345153aa9a4cfdec9ffdc5f2cbe923d13b902c80ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 10492 bytes

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