Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66b98c0596249b1…

MALICIOUS

PDF

151.1 KB Created: 2021-04-07 22:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1d07b7334ba497fd5bc47677fc80603d SHA-1: 8cc793316b891028be6acb56f10c3c6112f38cfe SHA-256: e66b98c0596249b1043d75490a2ac57ca7244f1f031c313c0e6b88da00cd01ac
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful 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://vilenefex.ru/wix?keyword=slayer+apex+guide+tera PDF link annotation
    • http://redofokotab.sportsontheweb.net/java_interview_questions_and_answers_for_freshers_2020_download.pdfIn PDF document text
    • http://gigezesuzobe.getenjoyment.net/fumivevaximijojusonajav.pdfIn PDF document text
    • http://potaberukogox.66ghz.com/classical_music_websites.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niwuzowebod.epizy.com/believer_song_in_tamil_in_isaimini.pdfIn PDF document text
    • http://sigedasubaduvep.rf.gd/tekken_3_game_apunkagames.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc4c382-8908-4e08-93d8-bb3c29238282/garmin_nuvi_2689_wont_turn_on.pdfIn PDF document text
    • http://purukalalud.epizy.com/allotment_of_share_ppt.pdfIn PDF document text
    • http://jubogaju.atwebpages.com/how_much_does_a_9.9_mercury_outboard_weight.pdfIn PDF document text
    • http://zevesijuduma.atwebpages.com/41384420993.pdfIn PDF document text
    • http://dofanetanezuji.rf.gd/green_revolution_file.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/how_much_jail_time_for_3_felony_charges.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dae48f0c-113d-4ebb-920d-e84cdaab6697/condition_of_postmodernity.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/hp_elitebook_2560p_memory_specs.pdfIn PDF document text
    • http://litopojijerel.epizy.com/aaru_tamil_movie_song_masstamilan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7371f43c-ce34-4374-a952-5e6c0a4e0bb0/risuwovenogafofapatisi.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/teacher_s_guide_grade_9_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57146ded-b059-4efb-98dd-f0d5e7a377a5/87786876276.pdfIn PDF document text
    • http://gojikelo.epizy.com/les_articles_definis_indefinis_et_partitifs_exercices.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BCF 37084 bytes
SHA-256: 4bf75096f991f273f5a39156904eee224287112a2e5eee77377afc55d5627ffb
font_01_sfnt_off0001fea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEA3 5224 bytes
SHA-256: 175fa2fb18a77c36f2b985633f7073724f49ada7c500c9664d007299e6151056
font_02_sfnt_off00021080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21080 12248 bytes
SHA-256: 1ea6526e3d0672f79dc3a8402dd82cb53caf03d100d970cad9b59311b500f88e
font_03_sfnt_off00023845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23845 16160 bytes
SHA-256: 31f54bf1b2a0bd5fcefce680aa7bc0ab7b2c48a0f9a6877104dd616c0c0a5462

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