Malicious PDF — malware analysis report

Static analysis result for SHA-256 59627be1dd04124c…

MALICIOUS

PDF

88.4 KB Created: 2021-02-16 16:53:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 48992d9cab24661da5500b5d667552c7 SHA-1: b8d075c3dd41c7985b0abebb4d670a61e5861265 SHA-256: 59627be1dd04124cbe8a4c3c9c232c1efb5f1019bc6572f06b62f847d7869dae
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a medium alert for being a link farm on disposable hosting. The ML classifier also assigned a high probability of maliciousness. The embedded URLs and the nature of the heuristics strongly suggest this document is designed to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+does+facilitator+mean+in+2k In PDF document text
    • http://geesecam.com/27676392823vvvcq.pdfIn PDF document text
    • http://parhelifrl.space/community_helpers_worksheet_kindergartenzmhnm.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/E6JoUha/talking_thomas_and_friends_toys.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/jbid49w/3d_city_driving_games_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/Sohhrgf/goldlink_crew_remix_lyrics.pdfIn PDF document text
    • http://bluebadgeapproval.com/dubelofurusaboldo39x.pdfIn PDF document text
    • http://voirly.xyz/galibijerijadewilovwmuuj.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/GUIghxd/nerirazonoturukotu.pdfIn PDF document text
    • http://educationonline.website/direito_processual_civil_pedro_lenzarpos1.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/aSAVO6U/73969301898.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/chhattisgarhi_gana_full_dj_song1vz1h.pdfIn PDF document text
    • https://cdn.sqhk.co/xivudebisov/hfgdghQ/zombie_killer_survival_3d_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/jjghjeV/shadow_fight_2_special_edition_apk_download_hack.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/kisimujuk/47251006957.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/esprit_de_l_athisme.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/addicted_full_movie_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/900656726.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/kegagulixevisufi.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/75559695846.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_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 5468 bytes
SHA-256: 06b773154310a618c3cfa5326780195f9116e3640dcc82994b7fbc81531c499d
font_01_sfnt_off00012d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D23 11584 bytes
SHA-256: 4a62c2e34910aa4b5cec94669087675cc45d09d7827c92283767bc21bc9fefd5

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