Malicious PDF — malware analysis report

Static analysis result for SHA-256 b396e5f768c988ce…

MALICIOUS

PDF

75.3 KB Created: 2021-05-17 20:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f7fe0bf202a7f0c5cc4137f3cd396595 SHA-1: 2af96b5f9cd15c289cd0281e19f62736be746b71 SHA-256: b396e5f768c988cef10cfd200bcd7b86f8e0c01d47f9a29dcca914ff0040f8ac
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains numerous embedded URLs pointing to external sites, with one specifically identified as part of a link farm on disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=their+eyes+were+watching+god+chapter+13+summary PDF link annotation
    • http://sowoxapexemex.sportsontheweb.net/34457293755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368976/normal_5fee4a36ee1a5.pdfIn PDF document text
    • http://getsol.xyz/golds_gym_xrs_50_replacement_partsjvuhv.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/entrepreneurship_program.pdfIn PDF document text
    • http://optarfes.com/fifty_shades_of_darker_full_movie_free_download_mp4_filmywapz54l5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5fe1b25ea63c3.pdfIn PDF document text
    • http://usechambre.xyz/elementary_linear_algebra_howard_anton_sladerryp4k.pdfIn PDF document text
    • http://gelupulofevabek.medianewsonline.com/comment_fusionner_des_en_un_seul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_60445d6aeace4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://merowijesajov.epizy.com/xivuwanekuvikejubaxukige.pdfIn PDF document text
    • http://kesekerezox.epizy.com/visual_voicemail_transcription_android.pdfIn PDF document text
    • http://buzanuziti.myartsonline.com/79556792357.pdfIn PDF document text
    • http://guganevefaluson.rf.gd/internal_vs_external_locus_of_control_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0098bca8-629a-46f1-a606-4fa4fcb3aeb8/mezoperuruvatodu.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/bhagwat_gita_in_hindi_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df35703-eb1d-448e-b7e5-7a87bc5b36e8/the_choice_edith_eger_amazon_kindle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716e3057-dfed-4e72-a003-119d61e39202/poximeraxuguxuwafe.pdfIn PDF document text
    • http://gofugukalizugo.epizy.com/85623276638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6f8a97-4a82-41da-92ed-f6d40723a8ad/nolisudewowupumugavuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e45b0c-ce73-4823-a5e3-e52ec3c735cb/ai_vs_machine_learning_vs_deep_learning_quora.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_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 5812 bytes
SHA-256: 5fa5ef9ad84036da7932809da796d2d9b2478c2660003926423fdb1a728beb78
font_01_sfnt_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 10832 bytes
SHA-256: 5d75f51733d29e5f0fab327da00d3a3fc46c2d2a98a4175de098c7417096d1c1

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