Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f15c57c656b8ff2…

MALICIOUS

PDF

91.2 KB Created: 2021-03-23 16:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 19dddbd7257af34e7355bf0e4e207532 SHA-1: df041e662eb5cb21ea0e25a4f396f4a545e13550 SHA-256: 3f15c57c656b8ff2aade0bcec4aa3cf48e26965935743651edabf4bb445f0566
186 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external links, with one prominent URL pointing to a suspicious domain. The PDF's structure and embedded links suggest an attempt to manipulate search engine results or direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://kuzutuzo.ru/award?keyword=wonderland+park+map+pdf PDF link annotation
    • http://kevifiregerufug.scienceontheweb.net/basic_c_programs_asked_interview.pdfIn PDF document text
    • http://kutejovanog.getenjoyment.net/l_abcdaire_de_gilles_deleuze.pdfIn PDF document text
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/6762380.pdfIn PDF document text
    • https://xuwogufovesuvem.weebly.com/uploads/1/3/1/4/131406895/mazelewasul.pdfIn PDF document text
    • https://levufiturosotin.weebly.com/uploads/1/3/4/4/134466711/2dbe5d7c.pdfIn PDF document text
    • http://mifvideo.space/agneepath_song_musicbadshahtaenv.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/how_to_write_an_essay.pdf.pdfIn PDF document text
    • http://future-techno.ru/souzasim_project_pc_downloadgcw7m.pdfIn PDF document text
    • http://vnatural.space/nominal_ordinal_interval_ratio9v7gp.pdfIn PDF document text
    • http://reduslim-siteofficial.site/interview_questions_tips_and_answersjlv2k.pdfIn PDF document text
    • https://jadotonevuwupu.weebly.com/uploads/1/3/1/4/131407011/turosunekoguni.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/5f37f3e52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5816cb0e-4576-45c1-b2a1-1f2622c17a84/how_do_i_get_disney_plus_on_my_sharp_aquos_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/761c933e-985e-4cab-b1a4-85d3cc81f66a/dowukazegepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e1ee07-6122-4a53-b9a0-df73b348dd1a/ingenuity_by_bright_starts_-_cradle__sway_swing_bella_vista_manual.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_899a388565f94b4188b80471afdb38e8.pdf?index=trueIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_0dbcfc39bc0247d490581bbdf1a65812.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/bissell_powerforce_powerbrush_carpet_cleaner_not_spraying.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_2cffb12bf5dc439c9e598fe5390817d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7353c0f4-ebce-4775-993c-cf993af57766/37158390192.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/bovine_serum_albumin_adalah.pdfIn 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_off000126cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CB 5088 bytes
SHA-256: a2d56badbd910273c890d4c3ddaa77f4de685b0a0475743cac759c8850c285cb
font_01_sfnt_off00013814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13814 11300 bytes
SHA-256: 53833caf9fc07bad054689f08e88977bedb84eaa78c68f39b87dd3904aac5183