Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38c52b3cdc073a2…

MALICIOUS

PDF

77.1 KB Created: 2021-02-13 07:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6a9ad058dc9aa1bd9bb569f83f76d8e5 SHA-1: 28086497f4d584cc00ef5f6410dbadb1f6d9c935 SHA-256: c38c52b3cdc073a2eb7bd23eeaba8bfd92a147587e77f224798f24df98143c5d
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a URL that is likely part of a phishing or malware distribution scheme, disguised as a study guide answer key. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=biology+study+guide+answer+key PDF link annotation
    • http://bitcoins-profits.com/35703854032ibbcw.pdfIn PDF document text
    • http://kebotup.66ghz.com/best_bollywood_songs_app.pdfIn PDF document text
    • http://legendarycraft.ru/pvr_iptv_simple_client_zip_downloadaejk2.pdfIn PDF document text
    • http://livethailand.fun/sales_dashboard_ppt_templatet8mtr.pdfIn PDF document text
    • http://rijepesejib.22web.org/66887128649.pdfIn PDF document text
    • http://ryduslim.website/curso_de_biomagnetismo_dr_goizwiiz3.pdfIn PDF document text
    • http://pefuwujoxuroj.iblogger.org/puzzle_puzzle_all_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wagamaxoja.rf.gd/adirondack_hiking_map.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/30185194035.pdfIn PDF document text
    • http://nanabiwilave.epizy.com/bakit.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/57226040845.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/esclerosis_multiple_recurrente_remitente.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/blackberry_keyone_android_oreo_update.pdfIn PDF document text
    • http://getetir.epizy.com/kapen.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/37501087543.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/wastewater_management_introduction.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/mumibibuvavadezal.pdfIn PDF document text
    • http://gafevudivexer.rf.gd/use_worksheetfunction_vlookup_in_vba.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/city_building_games_apk_mod_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/aptitude_test_papers_of_infosys.pdfIn PDF document text
    • http://devoleresi.rf.gd/gepim.pdfIn PDF document text
    • http://resuzebapaluga.rf.gd/best_day_of_my_life_karaoke.pdfIn PDF document text
    • http://dawiwafawuz.epizy.com/dakipofijak.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_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 5300 bytes
SHA-256: 91a3895de62a8e865ea36608580e0bea493ab17c0ee5c812ad71177371eee0b7
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 10492 bytes
SHA-256: 694dc46e383a7bab16ce71d433127347e5d394f14edcd4b67782c3f71412ffa2

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