Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b23b191bc238f2…

MALICIOUS

PDF

82.0 KB Created: 2021-03-10 02:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6533849ddab7d9dace30a187baa6ff30 SHA-1: b0877c90cd946f55e2c37b9cf47138cec920f1a1 SHA-256: 21b23b191bc238f255b54cbd83406630b208496630c97436d2844b0e023e0f1f
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable or suspicious domains. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically phishing. The document body, though heavily obfuscated, suggests a lure related to 'analogies practice test with answers pdf', aiming to trick users into clicking the embedded links.

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://druttle.ru/award?keyword=analogies+practice+test+with+answers+pdf PDF link annotation
    • http://zhigina.ru/what_is_the_nist_cloud_computing_reference_architecture_nist_sp_500-292vuchx.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/how_to_make_a_playlist_on_free_music_appf44ua.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/gewapasanogulekexi.pdfIn PDF document text
    • https://cdn.sqhk.co/mewuxedodi/jihi7ES/car_simulator_games_for_pc_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/bogijifaviba/rG3vkjd/27877757404.pdfIn PDF document text
    • http://baltika-trans.ru/female_sex_offender_risk_assessment_tools9372s.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/hI2Gjg3/samurai_kazuya_idle_tap_rpg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_5fed8f0de624e.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/jevagikasafator.pdfIn PDF document text
    • http://reggis.info/68046596531z5bfw.pdfIn PDF document text
    • http://jilet1.club/lego_worlds_100_savewtj68.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/ZeQiige/switzerland_official_language_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_60470ac5b7d1c.pdfIn PDF document text
    • http://mmmmmme.space/85914385505bqj3l.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/resevorejopef.pdfIn PDF document text
    • http://logmeinnow.xyz/callaway_golf_club_sets_costco21rry.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lelupiborojez.epizy.com/internet_manager_apk_pour_android.pdfIn PDF document text
    • http://ranulogeta.rf.gd/88823212328.pdfIn PDF document text
    • http://moxutomib.rf.gd/pokemon_emerald_emulator_free.pdfIn PDF document text
    • http://gafodix.myartsonline.com/lidatipuvobeboj.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_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 5496 bytes
SHA-256: 1d18e31c9dfa85f547483f155822d4c738bc0b90490594a4f2e5be0ae29ca4a1
font_01_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 10408 bytes
SHA-256: b6ddc4d367345e6ea9279723d75f7515a52e193e9fbfd1c8057b89fb61017595
font_02_sfnt_off0001252d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252D 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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