Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27e267566d02c89…

MALICIOUS

PDF

74.6 KB Created: 2021-01-22 12:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f5e256554abf2df493538ec81184bf14 SHA-1: 93bb02ba135c4a21657cb6e42d800a725499bfe5 SHA-256: e27e267566d02c8929434488afd9cca8446e26229601a1e7c99146e9b1d4d040
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically identified as an external URI leading to 'druttle.ru'. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a non-clustered link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or malware distribution.

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://druttle.ru/123?utm_term=stars+report+card PDF link annotation
    • https://site-1205776.mozfiles.com/files/1205776/paniguseju.pdfIn PDF document text
    • https://site-1168368.mozfiles.com/files/1168368/escape_the_labyrinth.pdfIn PDF document text
    • http://dawavuwera.22web.org/27567175325.pdfIn PDF document text
    • http://takotonefajale.22web.org/bafabati.pdfIn PDF document text
    • http://nuraramibifowom.22web.org/cholamandalam_car_insurance_policy.pdfIn PDF document text
    • http://xexogafuko.22web.org/letafijademapozopirojen.pdfIn PDF document text
    • https://site-1254052.mozfiles.com/files/1254052/6th_grade_social_studies_common_core_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bepinutarefe.rf.gd/schutte_self_report_emotional_intelligence_test.pdfIn PDF document text
    • http://fudewalazakukug.epizy.com/nintendo_ds_emulator_games_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/bootstrap_3_form_input_with_button.pdfIn PDF document text
    • http://nosifunugiwes.epizy.com/jsw_gi_sheet_dealers_in_bangalore.pdfIn PDF document text
    • http://didaledagaxuz.rf.gd/tripartite_guidelines_on_fair_employment_practices_tafep.pdfIn PDF document text
    • http://savexopuzasi.epizy.com/96948668765.pdfIn PDF document text
    • http://kexeban.rf.gd/toy_story_2_english_movie.pdfIn PDF document text
    • http://peronilekovo.rf.gd/adb_install_update_apk.pdfIn PDF document text
    • http://temekem.epizy.com/basic_life_support_steps.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/cocubes_aptitude_questions.pdfIn PDF document text
    • http://mawekipabotore.epizy.com/exclude_classes_from_jacoco_report_gradle.pdfIn PDF document text
    • http://konevimojo.epizy.com/34243649267.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/school_letter_writing_format.pdfIn PDF document text
    • http://pefodajisotavuk.rf.gd/cards_against_humanity_pc_game.pdfIn PDF document text
    • http://tufobiwileke.rf.gd/adjectives_order_worksheets.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_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 5140 bytes
SHA-256: b85a3fd17e8beba42cb4e58237a69b4e7ab339404811bf7f62e6f8fab714ff44
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 9948 bytes
SHA-256: 26b1d0c9ce1a8ceaeeb35e7ed39b0c790b29d1a0cb78bcf16072d2ad8f35b3e3

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