Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3b5037ef18c749…

MALICIOUS

PDF

75.4 KB Created: 2021-03-18 19:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a1c115ca028374c636b508d5cfdd9362 SHA-1: ad025a2633e7508a0c323f4c11387e3ad727e883 SHA-256: 2b3b5037ef18c74927aed470c2847d48fa494cc640cc2e4cafd563389d49270f
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a high concentration on disposable hosting and redirector services, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan. The embedded URLs suggest the primary goal is to redirect the user to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=graco+magnum+project+painter+plus+paint+sprayer+review PDF link annotation
    • http://ecoservice-vlad.ru/examen_espaol_quinto_bimestre_cuarto_grado_primaria9l39o.pdfIn PDF document text
    • http://trenolgia.buzz/dowotijafargrym.pdfIn PDF document text
    • http://zigugijolena.iblogger.org/akruti_bengali_font.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_5fe8e319c4158.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/227454751555ctmi.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/92685640342.pdfIn PDF document text
    • http://suvexavez.iblogger.org/how_to_hard_reset_canon_mp250.pdfIn PDF document text
    • http://uscreditinquiry.info/conceptual_physics_reading_and_study_workbook_chapter_10_answersi7r4n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469119/normal_6040008e01639.pdfIn PDF document text
    • http://yourcy.com/sotudutuwijejamo3qn94.pdfIn PDF document text
    • http://sellamorem.com/list_of_coordinating_and_subordinating_conjunctions_in_german9cnxx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475738/normal_5fd80be0e014f.pdfIn PDF document text
    • http://lg-copyright.com/how_much_is_a_ps3_controller_worth_at_gamestopxdzyr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jonora/destiny_2_class_selection_guide.pdfIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/68655545495.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/whens_the_next_game_of_thrones_book.pdfIn PDF document text
    • http://setarazenit.epizy.com/ink_cartridges_for_hp_envy_120_printer.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_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 5616 bytes
SHA-256: 607a1a2ec47cddb512b898c9dd5cefc511434fd8dbe1b9dab462ea34ece1eda9
font_01_sfnt_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 10480 bytes
SHA-256: c04cc9fec71117694298ef74ec61b676b36a8f05bc4d1488b4a78670821d8290

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