Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8e3534f88e877e…

MALICIOUS

PDF

119.1 KB Created: 2021-06-08 14:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 243a48b8fb6f457fee57ca2d5bfe59c0 SHA-1: 051a6c0dc96a3d6fc99aecc873753f46c4a0b0dd SHA-256: 4b8e3534f88e877e82821e083a7a82a104aaa8fd0e021b3e7af6b87121062d87
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site for further exploitation. The document body, though partially corrupted, suggests a lure related to 'free genetics books'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/pbw?utm_term=libros+de+genetica+humana+pdf+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390071/normal_6025ecc048afe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5ffb57c94e63e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448746/normal_5fcae76560d9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_60b8fb019f42b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_601d4f098d6d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wamotarirup.pbworks.com/f/what_is_the_best_workout_for_an_ectomorph.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/f/gramatica_c_present_progressive_answers_level_2_pp._124-126.pdfIn PDF document text
    • http://watusuxipidu.pbworks.com/w/file/fetch/144424161/how_much_does_a_medical_research_analyst_make.pdfIn PDF document text
    • http://kefatezalix.pbworks.com/w/file/fetch/144748335/black_desert_online_wizard_pve_build.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/79203653603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f468ce3-5f35-44dd-bfb5-e1ed73179985/81008372966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f070c8e0-62b3-49f0-8ef2-308a3a1a4464/i_am_who_i_am_bible_scripture.pdfIn PDF document text
    • http://wenitudodub.pbworks.com/w/file/fetch/144551283/kusoxitadetured.pdfIn PDF document text
    • http://tejudafo.pbworks.com/w/file/fetch/144460059/verbs_quiz_for_grade_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74190b0-baab-46ef-ac51-509708eb5249/somewhere_over_the_rainbow_sung_by_judy_garland.pdfIn PDF document text
    • http://morabef.pbworks.com/f/goal_en_espaol_pelicula_completa.pdfIn PDF document text
    • http://moxulolo.pbworks.com/f/ti_nspire_cx_cas_instruction_manual.pdfIn PDF document text
    • http://xefuvut.pbworks.com/w/file/fetch/144807459/94675746002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1e66cd-5fee-46b7-be27-a2822a30599c/renugaxelugobudoborekusuf.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144427833/90095514584.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/25576038569.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144419778/best_server_for_ark_ps4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17785 5616 bytes
SHA-256: e6c78c0f2284df284f37c939d256b89f0683c84e48790b1a8640dadd6469f8ee
font_01_sfnt_off00018a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A77 13940 bytes
SHA-256: bf36c94abc9ae956e877bf8a018aaae81af47c077693f72516f1cede07c79d22
font_02_sfnt_off0001b6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6E5 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf