Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fc8bd1442a8653…

MALICIOUS

PDF

77.3 KB Created: 2021-03-30 20:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7057c3e69ebda743ac5ea08d30cf8fa SHA-1: ec429d443a875b6f47872f6cde9b8f87734a5ecc SHA-256: c3fc8bd1442a865313b223ddad87018066484930ea974f5a0c69160ebb4d8016
134 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=the+armor+of+god+priscilla+shirer+reviews
    • http://ragadugizidej.22web.org/how_much_do_hardware_engineers_make_a_month.pdf
    • https://zogelamugem.weebly.com/uploads/1/3/0/7/130775951/dosepofubon_degipom.pdf
    • https://lefiletigej.weebly.com/uploads/1/3/4/5/134597596/zilus_sobiraburak_wifelo_dinemugi.pdf
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/dasifiseko_nedafima_bobivenifubagi_xuradiki.pdf
    • http://jepewadagamer.scienceontheweb.net/xudeperumexudusesixobexo.pdf
    • https://cdn.sqhk.co/mopomotop/SOIoYhc/4476318072.pdf
    • https://zakoponuzu.weebly.com/uploads/1/3/5/9/135992890/2283178.pdf
    • https://cdn.sqhk.co/pozuwifofub/gdjahai/mini_arcade_two_player_games_xbox_one.pdf
    • http://wofijitabudo.22web.org/64100259860.pdf
    • http://20970907.net/guided_meditation_for_sleep_storygpvup.pdf
    • http://particuliers-societegenerale.xyz/vuduletiden26zo.pdf
    • http://jonebosu.mywebcommunity.org/platform_business_model_canvas.pdf
    • https://cdn.sqhk.co/xiladuxe/oWKiv2G/52328102425.pdf
    • https://teseresoj.weebly.com/uploads/1/3/4/6/134644138/8434077.pdf
    • http://suraneb.scienceontheweb.net/caractersticas_del_aprendizaje_significativo_y_memorstico.pdf
    • http://nedabemimekoz.iblogger.org/83689549078.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rukapanaped.epizy.com/21223953245.pdf
    • http://bugenerefajujus.atwebpages.com/organic_chemistry_notes_for_class_11.pdf
    • http://pixagikaw.epizy.com/sketching_graphs_of_functions_worksheet.pdf
    • http://pamigobew.rf.gd/dedizefiw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed82.bin
5b20465e5b550b092707555bc7c3fe31c4ebd8d3e87c2041ab94e8cc03fddf6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 5668 bytes
font_01_sfnt_off000100b7.bin
68d5da83f3f0d278c5b77b3c81255617de198479268ca3cf963bac88497c9c9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 11508 bytes

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