Malicious PDF — malware analysis report

Static analysis result for SHA-256 14fef39490b458f0…

MALICIOUS

PDF

76.9 KB Created: 2021-03-18 22:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f756a9673cc84edb841a75dbd7605a48 SHA-1: 7861ff4b5824bdc28d9045e01b95f50dbe5c9f91 SHA-256: 14fef39490b458f0a4f80738080496e1bed0b541c1d4c69e8feba34f070b0b86
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable hosting sites, a common tactic for distributing potentially unwanted software or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to download content, likely malware or adware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/wix?keyword=equalizer+pro+apk+free+download
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/wosirekalikap_joruzolima_nutorif_wanajinemit.pdf
    • https://cdn.sqhk.co/nosuterib/eCBhjjh/pistol_sound_ringtone_download_mp3.pdf
    • https://rudagaje.weebly.com/uploads/1/3/4/3/134310377/misipofet.pdf
    • https://cdn-cms.f-static.net/uploads/4504922/normal_60481de43f4d7.pdf
    • http://muzibatixabu.mypressonline.com/sapilezugabukapu.pdf
    • https://static.s123-cdn-static.com/uploads/4495269/normal_5fe19a4646f36.pdf
    • https://cdn.sqhk.co/pawosuku/gfhdLhg/research_presentation_format_powerpoint.pdf
    • http://manamuposa.getenjoyment.net/94104354987.pdf
    • https://cdn-cms.f-static.net/uploads/4481684/normal_5fd67f264f881.pdf
    • http://bukapim.mywebcommunity.org/historia_de_la_depresion_infantil.pdf
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/metixazid_bunegabam_bizipino.pdf
    • http://somixewavado.sportsontheweb.net/ruwef.pdf
    • https://xawawamofolapus.weebly.com/uploads/1/3/1/4/131436997/letukukom_fuseritelafad_nubom_luguwep.pdf
    • http://xomunuxeju.sportsontheweb.net/93491952753.pdf
    • http://kepuxom.mypressonline.com/how_to_draw_a_face_3_4_view.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kuwitabetegipo.myartsonline.com/78966237918.pdf
    • http://perexuwofogefo.onlinewebshop.net/roduxovalezek.pdf
    • http://riveminigokoxa.myartsonline.com/braun_thermoscan_how_to_use.pdf
    • http://tuzuxutetug.atwebpages.com/mudedajefonon.pdf
    • http://jimomurapujivo.onlinewebshop.net/ingersoll_rand_p185wjd_air_compressor_parts_manual.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_off0000ecc0.bin
52717452b4ec1357ac2b7d3a22eb26d29e4359948ec7b777fe1b908ad4268a08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 5148 bytes
font_01_sfnt_off0000fe74.bin
033092321027b9b7e2ba852a7b4a980b9b31db94d7e19e9a57fd2b6071c568f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 12024 bytes

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