Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fc43d9a4dc375f…

MALICIOUS

PDF

73.9 KB Created: 2021-03-21 09:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4e8da768e99fba28fa4e869b680ed0f SHA-1: ed8c1ee9726ba47a97a7ae264e13846335db6c6a SHA-256: c3fc43d9a4dc375fc35ba79c59f8610368607daac6356c3a5251170a5deae53e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/strik?utm_term=the+divergent+series+allegiant+download+in+hindi
    • https://xovonanukotu.weebly.com/uploads/1/3/4/8/134898985/nibapedivozozur-bipunuda-sevajulawojibuk-muteve.pdf
    • https://kevavabine.weebly.com/uploads/1/3/1/4/131406582/625729.pdf
    • http://usersdeviceprotectionservice.site/yl_38_datasheetq4z05.pdf
    • http://tramlaweq.online/free_forklift_safety_video_downloadet9i5.pdf
    • http://jodebisap.22web.org/what_type_of_charger_does_a_galaxy_s9_take.pdf
    • http://azorocheat1.xyz/best_criminal_law_textbook_ukmggw3.pdf
    • http://affilateapp.online/msi_970a_g43_cpu_kompatibilittws22m.pdf
    • http://vsedlyatebya.xyz/xuan_feng_shao_nu_2x20vd.pdf
    • http://gladkoe-telo.xyz/4525970768rn190.pdf
    • https://sojizekupiguj.weebly.com/uploads/1/3/4/5/134586608/1418854636.pdf
    • https://xazoxudigoruxov.weebly.com/uploads/1/3/4/0/134095876/kiwejes_tekinanesuxipim_banasavipiw_nalasipom.pdf
    • http://atelier-spb.com/how_do_you_review_a_care_plan3ttv1.pdf
    • http://lnstagramverifiedsbadgeforms.com/kusatolofi2z1bm.pdf
    • http://xupajililudolod.22web.org/stalking_jack_the_ripper_kerri_maniscalco.pdf
    • http://oneitshop.pro/sears_diehard_battery_charger_engine_starter_manual0myqd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://peburameg.epizy.com/mariam_khan_reporting_line_video.pdf
    • https://uploads.strikinglycdn.com/files/4b73213e-412b-44d1-9c7c-ea0e62d7dc3b/die_kleine_raupe_nimmersatt_arbeitsbltter_kostenlos.pdf
    • https://uploads.strikinglycdn.com/files/3a0f09dd-91b3-43e5-9c9a-0f33495fd04f/4876432745.pdf
    • http://suwedafi.epizy.com/lg_android_secret_codes.pdf
    • http://febuzoremasovev.epizy.com/addition_reactions_of_alkenes.pdf
    • https://s3.amazonaws.com/lemerisinivum/sosomirudi.pdf
    • https://s3.amazonaws.com/metakibeme/anker_a7908_bluetooth_speaker.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_off0000defb.bin
cf9748f7b792837b7848d7d16edbad8afca8d5f88dfbe3d38eee085d5abbc1f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 5188 bytes
font_01_sfnt_off0000f0ad.bin
af3032678862fe3f48bc1c001b018c30f992f8aebcf374a584eeb6d39bd25079		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 11908 bytes

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