Malicious PDF — malware analysis report

Static analysis result for SHA-256 396b2c08bcd6aad4…

MALICIOUS

PDF

75.9 KB Created: 2021-03-04 23:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: efe55dea931c8fc51b74917ca635ee2c SHA-1: 1b5f568fdad5252bc89dcae5692ddc00d6d79354 SHA-256: 396b2c08bcd6aad450fb039324b1e78e4138cf9c0d856e76940575316f01ff63
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URIs pointing to disposable hosting domains, suggesting a link farm or redirection scheme to deliver malicious content. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for creating malicious PDFs.

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://jottigo.ru/strik?utm_term=low+carb+keto+diet+foods PDF link annotation
    • http://dumubemajizukov.medianewsonline.com/jocko_molk_review.pdfIn PDF document text
    • http://digitalmedialit.com/nosalasifukuzekamozuxneijx.pdfIn PDF document text
    • https://cdn.sqhk.co/gituxogud/jdRFAA1/i_love_crosswords_3_level_8_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/TyPghcf/microsoft_azure_fundamentals_certification_practice_test.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/what_is_six_sigma_lean_processes.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/jhagg5E/69991261802.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/great_writing_4_great_essays_great_writing_new_edition_4th_edition.pdfIn PDF document text
    • http://idealicaitaly.site/how_to_clean_bose_wave_radio_cd_player9d69s.pdfIn PDF document text
    • http://storedubai.shop/2883813980gsauf.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/2jeDGib/airplane_cast_sick_girl_mom.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/blockchain_programming_java_tutorial.pdfIn PDF document text
    • http://jipegogujozu.22web.org/baahubali_movie_song_masstamilan.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/rupatojuko/steve_madden_aida_platform_sandal_women.pdfIn PDF document text
    • http://viwixalos.epizy.com/backtrack_5_zip_file.pdfIn PDF document text
    • http://pofulexurukuka.rf.gd/nimikidifud.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/kitutavikamuxobo.pdfIn PDF document text
    • http://jabaxuzadowepep.rf.gd/2019_chevy_malibu_premier_owners_manual.pdfIn PDF document text
    • http://xifimerin.onlinewebshop.net/surah_yaseen_with_urdu_translation_mp3_free_download_qari_sadaqat_ali.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/monthly_rent_payment_receipt_template.pdfIn PDF document text
    • http://kefujuvaw.epizy.com/wibunufu.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/badminton_court_diagram.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_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 5220 bytes
SHA-256: 89a0de88b0ca81c61c2c3ab5d7c2f91e210c59d0500e3604909a51804a83bfea
font_01_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 10108 bytes
SHA-256: d1389e18a4b8e8cd47d190f1f8fd2557ddd3bea96cde2a3940cdc8f96aea0c29

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