Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca1df24ac538a1e…

MALICIOUS

PDF

83.7 KB Created: 2021-04-07 21:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4ac4fc6e491d2ecc229251d3e1d998b8 SHA-1: 891b7bf41562a8ed2d3957e207630ba94b860b33 SHA-256: bca1df24ac538a1ec1e0a69bbf9791b946c8f656bafc9026f09f5fa210885758
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 is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure strongly suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/123?utm_term=thanksgiving+dinner+checklist+template PDF link annotation
    • http://namelesssouth.xyz/alienware_17_r1_service_manualo6jmb.pdfIn PDF document text
    • http://nosixavol.sportsontheweb.net/40411266879.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/jicYKic/bed_wars_mod_apk_android_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417213/normal_6006f1fe96630.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/jijpjdG/9168777324.pdfIn PDF document text
    • http://pribor-poverka.site/soil_classification_aashto_m145re76q.pdfIn PDF document text
    • https://cdn.sqhk.co/rifebonapesi/jZAyEhd/best_helicopter_simulator_xbox_one.pdfIn PDF document text
    • http://websporizle3.com/samsung_smart_switch_mobile_ios_downloadac5fr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_604cf207e8a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474478/normal_5feaf27febf70.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/zhexPZT/29991970306.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/glOie8I/best_mountain_bike_pedals_under_50.pdfIn PDF document text
    • http://jabudapitu.scienceontheweb.net/bridge_to_terabithia_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://telosizaba.onlinewebshop.net/pubawisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fffbcd4-a000-4cb8-96c6-bbc3f239a824/jeep_wrangler_body_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb913d0d-f506-4f2d-bd9a-5a9f6ef6daec/hp_envy_4500_print_settings.pdfIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_7404a4f951b64c11ac6fc3887d906c22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffdd34a-db56-430c-80b9-067d0270f840/the_spiritual_man_by_watchman_nee.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/gemadegam.pdfIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_85f7858a0f8445d1b86051ae6351cc0e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee9a9710-32ac-49e9-bb75-33cc269430c2/mepofixodox.pdfIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_a6d122b8c75648cc9c2f5a8cacdc5080.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_ce4847933e5b405fbf379d93d4f9eed6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7033df82-e546-4691-8073-132b68fb88fd/how_do_i_get_on_family_feud_as_a_contestant.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_eb86301721c3447f9042c2c0cacfa15e.pdf?index=trueIn 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_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 5560 bytes
SHA-256: 3a7f123fe198ed1a89e0e394cce783aef7567f2185429b4214053757f122f96f
font_01_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 11108 bytes
SHA-256: 45d99edbd5db0981e68b1c58a2f8b06efd0273efdd732b3b5535010499f08f00