Malicious PDF — malware analysis report

Static analysis result for SHA-256 381749a91442e670…

MALICIOUS

PDF

128.0 KB Created: 2021-03-08 01:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cb07c0fac4b95df3761ac2b6836e4e4e SHA-1: b63b3725829feba6d610cd3fff6b1433e307a434 SHA-256: 381749a91442e670454f276f7990531a1d98f73f120315c00e0711d2a9eddfd7
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body and embedded URLs suggest a phishing lure, attempting to trick users into downloading further malicious content from domains like maypoin.ru and kraftmann.su. The presence of external URIs and link farm characteristics indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/strik?utm_term=recommender+systems+handbook+pdf PDF link annotation
    • http://kraftmann.su/68280570283w52ss.pdfIn PDF document text
    • http://trysoda.club/409263827520nkzt.pdfIn PDF document text
    • https://cdn.sqhk.co/dekorasenu/Nahgibj/voa_news_learning_english_podcasts.pdfIn PDF document text
    • https://cdn.sqhk.co/felibepudu/jgjifLI/bogozalinemakebawaso.pdfIn PDF document text
    • http://mybatut.store/film_damour_en_streamingesv6x.pdfIn PDF document text
    • http://telgrm.site/295522198640bjqj.pdfIn PDF document text
    • http://geniusenglish.space/hunger_games_part_31hvjl.pdfIn PDF document text
    • http://italiahot.space/sarah_dessen_books_seriesxx0jp.pdfIn PDF document text
    • http://walletelectrum.buzz/noughts_and_crossesw3x4h.pdfIn PDF document text
    • https://cdn.sqhk.co/jomutepe/BidQhi4/2nd_grade_common_core_math_diagnostic_test.pdfIn PDF document text
    • http://gufutaca6.xyz/inkscape_resize_canvas_to_object0ujks.pdfIn PDF document text
    • https://cdn.sqhk.co/saboretiki/gelbZgg/feniraropi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ed6ecc-8324-4ca9-bb52-0b710f499ee6/place_value_2nd_grade_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0033fbaf-308d-48c1-bd31-06a58b9b659e/basketball_plays_diagram_app.pdfIn PDF document text
    • http://sowinoto.epizy.com/2017_acura_rdx_technology_package_manual.pdfIn PDF document text
    • http://zotubetujuna.rf.gd/92940745447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ab622e-7b62-474a-bbcf-ce683b96581b/rejumiratozidegejefegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9899515c-e341-4549-af5c-e39234db6f30/cant_get_cuisinart_food_processor_to_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932ed681-9d7f-4ca8-8079-26de2b783644/general_biology_1_textbook_answers.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_off0001b7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7BA 5676 bytes
SHA-256: 26e361503cf436486dbfc426e7bddb0d26af9928920d1c8b3adae830229e32b1
font_01_sfnt_off0001cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAE2 13088 bytes
SHA-256: 5c44a863cc2a6091ced432be86c0b68efed41923e44e334fe7008e7f81a16812

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