Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cdb6ccb045e9f7…

MALICIOUS

PDF

78.3 KB Created: 2021-03-26 09:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7956bc5b20eaed0eec58cbb63ca62f31 SHA-1: a805fee090342a40f788d585c189ab28ecbfa785 SHA-256: e5cdb6ccb045e9f7d0ea560006001a2caa96de2cb624fa1571f13e1b2945c23f
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'pelibifir.ru', which is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

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://pelibifir.ru/award?keyword=formal+email+greetings+pdf PDF link annotation
    • http://swast-group.website/cost_accounting_101mhp64.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/jdjcgek/zaxujojuwutowapopesuxe.pdfIn PDF document text
    • http://haifaiv.ru/over_the_castle_on_the_hill_lyrics_youtubesxkmt.pdfIn PDF document text
    • http://getsol.xyz/jolufasupusixan7q453.pdfIn PDF document text
    • http://mon-fortuneo.best/manual_limba_romana_clasa_7_onlinejjpq0.pdfIn PDF document text
    • https://cdn.sqhk.co/mozedizupi/pLifgfe/ledupijexusevilajomik.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/mhhhbhj/la_reina_del_sur_2_sofia.pdfIn PDF document text
    • https://cdn.sqhk.co/tarudifirew/ggLbpij/comprar_recarga_claro_guatemala.pdfIn PDF document text
    • http://copyrighthelpcentral.com/algebra_worksheets_8th_gradeytnsm.pdfIn PDF document text
    • http://shoppingyxplus.xyz/cambridge_english_dictionary_booksfq51.pdfIn PDF document text
    • https://cdn.sqhk.co/mesojofu/jijcZii/hay_day_game.pdfIn PDF document text
    • http://crubr.space/bluetooth_software_for_pc_softonicpoqde.pdfIn PDF document text
    • http://doctora.club/sales_agent_contracti5apx.pdfIn PDF document text
    • http://antinomi.design/81301021895y0hji.pdfIn PDF document text
    • http://sks-expertiza.ru/zugivevirekemokunipitoa0xvo.pdfIn PDF document text
    • http://nosinoski.shop/exogenous_ketones_before_bed02f6x.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/benubapopikaj/quran_recitation_with_bangla_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/lens_file_for_vray_camera.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_df6e0ef6d2114e74b5be201be9a17f23.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_fb2722e366844e22a22ef335c4e87af2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/android_emulator_app_store.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_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 5316 bytes
SHA-256: f79e33782e8d6b795d0edfb1c5e82a5d2b562facc7f42c285cc420d99930d54b
font_01_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 10912 bytes
SHA-256: 5783080efa82f13304edf12c680d6a54a4ab694b6a7e27a8f35bae7b17f8764b

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