Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e625baba14153c…

MALICIOUS

PDF

88.6 KB Created: 2021-04-07 05:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d5c73ce0a824fb25a0e1a50e95586328 SHA-1: 787157be84828055831d71598c098712d051a645 SHA-256: 67e625baba14153c90fd8ddd72cb2593cb2827fefc2338b431c593080561eed9
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to 'kuzutuzo.ru' which is flagged as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://kuzutuzo.ru/award?keyword=acido+sulfurico+ficha+tecnica+pdf PDF link annotation
    • http://wersita.fun/23827699716zou65.pdfIn PDF document text
    • http://maykistore.ru/vodobolorazakujep016wp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_602dfd87c45bc.pdfIn PDF document text
    • https://cdn.sqhk.co/bupusudiva/jdiosjf/digi_clock_widget_plus_2._2_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/Ehdgc8z/golf_practice_cage_net.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487623/normal_6055087f74a7d.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/jz5hgTy/bubble_bobble_arcade_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418777/normal_5ffd24463a9f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473415/normal_600c02cb6a4a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_5fd9ca09a4c2c.pdfIn PDF document text
    • http://pumba.fun/bakipuditu95e0w.pdfIn PDF document text
    • https://cdn.sqhk.co/poxofufiko/iiCjbft/skycraft_orlando_fl.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/hgih6c5/truck_driver_bhojpuri_movie_songs_free_download_mp3.pdfIn PDF document text
    • http://lizakoku.22web.org/dufudakegetofatuxepemu.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/jasadavebaga/capnography_waveforms_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1899ab6-a7fc-4e0c-8f3f-148ae4951c9e/51459706131.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/avent_electric_4_in_1_steriliser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0894fd3e-aac4-4740-877e-c4a7e3c1f555/side_by_side_book_1_chapter_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c02e92c-598d-469e-bc0e-95a6825759ca/85529012460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be474ac-48f7-4109-947a-04a67b5902f5/53992576909.pdfIn PDF document text
    • http://kuvuwimi.rf.gd/zawodumiko.pdfIn PDF document text
    • http://fujesotes.epizy.com/how_many_trials_of_apollo_books_are_there.pdfIn PDF document text
    • http://nulazuwob.rf.gd/48603954214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b5c5bdd-c89c-47e6-8b74-9b3bad08d37c/41673766299.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 5232 bytes
SHA-256: de4645a500a8e6fbf071d852b580ef1dbe0be51eecbec227b72a3dc79db9aa8c
font_01_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 2892 bytes
SHA-256: c8199f17bd381880238e2735e7e28090386b4640476cc55e7f3c2ced631c2ef2
font_02_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 12076 bytes
SHA-256: 76b574dd0b181889bd04cdf2f7e42e996747c71091cf17ee5dd5a83aad2248f7
font_03_sfnt_off00013dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC7 16432 bytes
SHA-256: 5cf4b778eeefe9ab669fe23148f19a5115f7de87efe605c8cf792b24c1b0b75f