Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8e690a3d51116c…

MALICIOUS

PDF

74.0 KB Created: 2021-03-28 06:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ddde19be2d2d57c23fd8387900687471 SHA-1: e6463a8fa52394f3c801197f91c50eb0b20cc9c3 SHA-256: 4f8e690a3d51116c07c067fbc85262c1b8bec09402aa2cae546641213c70a597
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that are flagged as suspicious and part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to educational materials to entice users to click the malicious links. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/award?keyword=big+ideas+math+red+answers+grade+7+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457330/normal_601dd0c06f760.pdfIn PDF document text
    • http://ttop-shop.com/65245727202qs3ky.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/mutezadu.pdfIn PDF document text
    • http://repair-kompov.ru/background_check_includes_credit_report2s5c7.pdfIn PDF document text
    • http://timinome.getenjoyment.net/tanda_dan_gejala_bronkitis.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/kinds_of_adjectives_with_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/VrbDZjb/kegazivadag.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/clgiXgi/gesuzupoxufe.pdfIn PDF document text
    • https://cdn.sqhk.co/dobajinorite/jLoyiat/72982440343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380540/normal_5feef4c608c03.pdfIn PDF document text
    • http://iminn.ru/vekofabaxufafoq4bqd.pdfIn PDF document text
    • https://cdn.sqhk.co/dazanukisafa/yiaKihc/adobe_flash_player_for_android_tablet.pdfIn PDF document text
    • http://mozovurezet.iblogger.org/vebixugavesab.pdfIn PDF document text
    • http://good-production20.site/33520416873rvbkp.pdfIn PDF document text
    • http://lnstagram-helping.live/the_secret_law_of_attraction_videonczb5.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/BMhjifB/barbarian_old_school_action_rpg_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jifisuxevizek.myartsonline.com/facial_expressions_visual_reference_artists.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b876ca3-6b0f-4bc8-879c-0568fbe2cb5b/sowuzokolilozelikuweka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4048a98b-7d98-4724-8709-282d8509fc1c/samsung_dv210aew_xaa_not_starting.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/biwadibetu.pdfIn PDF document text
    • http://kowewewabozete.epizy.com/timeloketipazexadalogurig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c8cf45-eb79-4e32-bb2b-c0f10764cd44/kuviwivi.pdfIn PDF document text
    • http://nutujetis.rf.gd/41718307296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7c8dda-c223-4fcf-8593-f1f69ea1cf49/poxirosivezekoboko.pdfIn PDF document text
    • http://wofavum.myartsonline.com/63845829718.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_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 5644 bytes
SHA-256: 116ddb8fe7e86d0087b1d44903b4e13b7975d48cdd730cde02a72b78c9a873e6
font_01_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 10328 bytes
SHA-256: a373bd9e4c027eb1af47afb8abe0b95f6aa460e07994c20a8ad8d97e4cd27902

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