Malicious PDF — malware analysis report

Static analysis result for SHA-256 256b7873bf2b0b28…

MALICIOUS

PDF

90.3 KB Created: 2021-03-22 14:36:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a24eb955af6b9c9a49926d7c05ae0b6e SHA-1: 587ff83f1833267462b99aba3b8c7310e0a67372 SHA-256: 256b7873bf2b0b2866f3920e04945ae61bc9a2b53fcb8b92cdbbd6d371f1adf6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://botokaw.ru/123?utm_term=yakuza+kiwami+2+majima+construction+guide PDF link annotation
    • http://rejorevubirobu.sportsontheweb.net/platicas_pre_bautismales_en_domingo_en_guadalajara.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/axenta_auto_clicker_downloadoyuyv.pdfIn PDF document text
    • http://compte-cmbretagne.best/wuxiviserigesuwafudosn65zu.pdfIn PDF document text
    • http://probmake12.xyz/free_stress_balls_uk4ktce.pdfIn PDF document text
    • http://fuxanujibiz.mygamesonline.org/14366932813.pdfIn PDF document text
    • http://ital-tess.space/pokemon_clemont_x_reader_wattpadx3dwr.pdfIn PDF document text
    • http://tikovg.xyz/amplificadores_de_potencia_clase_bd9kev.pdfIn PDF document text
    • http://katipef.medianewsonline.com/lg_vn170_release_date.pdfIn PDF document text
    • http://levantegroup.net/21153573643emjf8.pdfIn PDF document text
    • http://cetapp.xyz/838126242023yy3v.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/solving_compound_and_absolute_value_inequalities.pdfIn PDF document text
    • http://witaxolexigabi.mywebcommunity.org/52306524158.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/mejavadabokibizalaxixax.pdfIn PDF document text
    • http://50offit.pro/whirlpool_upright_freezer_instruction_manual4cvgm.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/fitumefiborad.pdfIn PDF document text
    • http://50offstore.info/how_to_mount_wd_my_cloud_on_windows_10grakg.pdfIn PDF document text
    • http://skidki-day.site/does_internet_get_capitalized9ozkm.pdfIn PDF document text
    • http://jusapp.club/52885087670k6jjz.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/db_legends_mod_apk_hokage242jp1ws.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/putupulumagasirir.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/zafekunevepagasanoguv.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/285421053.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/dfeh_right_to_sue_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/rasaroporawazekamubib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E1 5484 bytes
SHA-256: fcb4743bc328f9d8efc93ac89ff5c3b2bc35426aea000a5a7760eb48051e8a8d
font_01_sfnt_off0001278b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278B 10988 bytes
SHA-256: 956af977af18843f840b68ce7a0fb674354b463be13ddca997d9c0caf015dafd
font_02_sfnt_off00014cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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