Malicious PDF — malware analysis report

Static analysis result for SHA-256 32025436dd4bc86c…

MALICIOUS

PDF

71.9 KB Created: 2021-02-13 09:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b6c880e6511d7f1e83b4bc420e275afd SHA-1: 3a998caed3af95ee488ac58c887bf37e7c39f434 SHA-256: 32025436dd4bc86c00f301016fa0b53ea98f7defe0c65d0a297f6e97dae4ef7c
126 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wb?keyword=blackstone%20group%20annual%20report%202017 PDF link annotation
    • https://cdn.sqhk.co/zukasedu/9hNibsy/tewilenenizupovegevopaxep.pdfIn PDF document text
    • http://tesidakikize.iblogger.org/motifibezusixelupa.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/ififvgh/usher_new_songs_2020_mp3.pdfIn PDF document text
    • http://luminar4-download.xyz/a_contribution_to_the_empirics_of_economic_growthx6ekr.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/ahiSPii/super_pinball_master.pdfIn PDF document text
    • http://trenketo.buzz/66981339721u9zvf.pdfIn PDF document text
    • http://dreabling.online/multiplying_fractions_word_problem_worksheet5uqcw.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/gghcajd/mevomotezor.pdfIn PDF document text
    • http://rusakova.space/71070186806e6erd.pdfIn PDF document text
    • http://unlockdeals.shop/aberdare_cables_application_forms6gn3c.pdfIn PDF document text
    • http://umkatrade.ru/amazon_prime_video_monthly_cost_uae8tau5.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/d1jhhj2/citrus_tree_new_leaves_falling_off.pdfIn PDF document text
    • http://shoop-ft.ru/contratos_de_arrendamiento_para_imprimir_puerto_riconn54p.pdfIn PDF document text
    • http://free-at.pro/going_to_or_will_exercises_with_answers911ej.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/gvicljg/91460876766.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/fxwgeAd/53925912719.pdfIn PDF document text
    • http://bet-info.ru/lista_cdf_hd_m3uibzi4.pdfIn PDF document text
    • https://cdn.sqhk.co/papedajapej/qkQhfgh/xejogizaruti.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/hPr2haX/37317285241.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wetetepipemo.rf.gd/77940483506.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC60 5456 bytes
SHA-256: 28abef073123c5b925c76658f30fa9d81530384a4c285b768b089246e3fe4f73
font_01_sfnt_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 10864 bytes
SHA-256: 963b4fd5fb845b1f80b8039ed67a6736caed35cddb71217082e6a1a762d2d510
font_02_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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