Malicious PDF — malware analysis report

Static analysis result for SHA-256 864656cbf7f17999…

MALICIOUS

PDF

111.7 KB Created: 2021-06-04 16:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6df022899f4d51259864e12cf225f32 SHA-1: 88a0403cb00c54d7e45a0ad7e3e58ebc6e29c815 SHA-256: 864656cbf7f179999f3ecb86a4035fc73dabf65d5fec6ca88e12b7380c403145
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as part of a link farm designed to direct users to other sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://irlanc.ru/pbw?utm_term=electronic+devices+floyd+9th+edition+solution+pdf
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/d04cdedbc15.pdf
    • https://kisupijun.weebly.com/uploads/1/3/7/5/137502160/9883931.pdf
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/keluzejuzilajim.pdf
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/zupoleve.pdf
    • https://kibixaxetoro.weebly.com/uploads/1/3/4/8/134861284/4015391.pdf
    • https://vupavekana.weebly.com/uploads/1/3/4/4/134493500/lozux.pdf
    • https://rikinosi.weebly.com/uploads/1/3/4/3/134352476/5e5200.pdf
    • https://kijemaroxajum.weebly.com/uploads/1/3/5/3/135397629/b6d6e5decc.pdf
    • https://tebozelekunoton.weebly.com/uploads/1/3/1/4/131453588/2136072.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a769455e-4468-4f93-ace9-d0bebbae91cf/hp_laserjet_4200_series_driver_download.pdf
    • https://uploads.strikinglycdn.com/files/d6625d6b-7d05-479e-b996-c9d7b5d957ef/24637435269.pdf
    • http://barumena.pbworks.com/w/file/fetch/144458382/comic_the_walking_dead_7_espaol.pdf
    • https://uploads.strikinglycdn.com/files/ab4c6c07-de64-4713-b0cb-d78501437c3c/how_to_configure_arris_surfboard_sbg6580.pdf
    • http://zuxanuj.pbworks.com/w/file/fetch/144605475/indiana_online_driver_improvement_test_answers.pdf
    • https://uploads.strikinglycdn.com/files/68b3f7f5-bdb0-4fca-bf6e-0de4d6602e53/harry_potter_half_blood_prince_game_cheats.pdf
    • https://uploads.strikinglycdn.com/files/634fbc99-dbea-4bec-bcb4-ec60999e3f1b/59822399681.pdf
    • https://uploads.strikinglycdn.com/files/274766c2-e06a-4de4-9439-8cd8c4a082fb/o_iluminado_filme_online_legendado.pdf
    • http://fuxedemama.pbworks.com/f/pcos_indian_diet_plan_to_get_pregnant_in_hindi.pdf
    • http://gamaxidad.pbworks.com/f/46154351674.pdf
    • http://sisagexal.pbworks.com/f/vibakuwadipujo.pdf
    • https://uploads.strikinglycdn.com/files/8d49506c-e17d-49ca-8a94-8a7bff168a21/fojaderotedetetisat.pdf
    • https://uploads.strikinglycdn.com/files/55427875-ddc7-43c0-a8d4-cd2993015eba/58970379972.pdf
    • https://uploads.strikinglycdn.com/files/84af6518-188e-4ee9-b554-5a95b2f933ef/what_does_it_mean_to_dream_of_having_a_baby_girl.pdf
    • https://uploads.strikinglycdn.com/files/4b8ef968-5275-470e-b383-a6f9bebed33d/mutants_and_masterminds_dc_heroes_and_villains.pdf
    • https://uploads.strikinglycdn.com/files/87a8a559-530d-417b-9e2d-86c015b84463/29544328289.pdf
    • https://uploads.strikinglycdn.com/files/0595245e-62f3-4b6a-9765-bf969f9a6159/bodyweight_training_program.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_off0001734f.bin
0baae48ecb9264175e1b1a031782af592c8d4773600b01b61b922f6b502dc8ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1734F 5308 bytes
font_01_sfnt_off0001856c.bin
2e16d4611ae8462f8eb9e6973a40860f3fcc0b719a3f7a18c7ac69938ea329b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1856C 12524 bytes

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