Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a7cf59f817bcfe…

MALICIOUS

PDF

82.1 KB Created: 2021-03-22 13:35:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 580b5d991cb4ed45cff9686f3f25163c SHA-1: 9900adbe26c3f34b6533b6419c60d2998a4f54c5 SHA-256: f9a7cf59f817bcfe3a2e28b11e93771d14fb0d8e7fbdab4c9b1fd7a63ad3e105
134 Risk Score

Malware Insights

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

The PDF contains numerous URLs pointing to disposable hosting, indicative of a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the 'download button' heuristic further support this, suggesting the document is a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=twilight+free+download+300mb+mobile+movies
    • http://puwonasomoso.22web.org/border_design_certificate_template.pdf
    • https://cdn.sqhk.co/kojupiloxifi/6qVKBig/cotswold_water_park_picnic_sites.pdf
    • https://cdn.sqhk.co/wifinalimow/icjjhiE/82258503572.pdf
    • http://raxejudesezix.scienceontheweb.net/roku_soundbar_black_friday_2020.pdf
    • http://kimisorunutom.medianewsonline.com/nixasowozozoviseragoxu.pdf
    • http://ziwotixog.22web.org/mixajib.pdf
    • http://dusejetiwogodad.getenjoyment.net/jokabojodabawepoje.pdf
    • http://nositadox.mypressonline.com/ureterolithiasis_adalah.pdf
    • http://midikakuvekume.mywebcommunity.org/93866785497.pdf
    • http://rimelutafoterir.iblogger.org/linux_administration_study_material.pdf
    • http://mowefopovog.mywebcommunity.org/43470900110.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rovarede.rf.gd/when_i_was_puerto_rican.pdf
    • http://duxepivol.myartsonline.com/a_travs_de_mi_ventana_descargar.pdf
    • http://pitupeg.epizy.com/arguments_about_wearing_school_uniforms.pdf
    • http://vujofif.epizy.com/come_verificare_aggiornamenti_app_android.pdf
    • https://s3.amazonaws.com/kizugokofo/deus_ex_human_revolution_boss_fights_guide.pdf
    • http://bolopanezodubun.rf.gd/27492458550.pdf
    • https://s3.amazonaws.com/dufekifaral/giresun_weather_report.pdf
    • http://vefodipox.myartsonline.com/nuraxokejorum.pdf
    • http://fiwemigusa.rf.gd/python_decorator_tutorial.pdf
    • http://reluwiz.epizy.com/genetic_programming_and_data_structures.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f0.bin
2ed369180dc041cad258b78cdfb0f93bc745d5fc077b3730b0bab7b81953e4ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 5656 bytes
font_01_sfnt_off00010803.bin
88560523feeb4e3866dab90f5593367b94061bab0164649aad2da1f890a8019f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 10724 bytes
font_02_sfnt_off00012c92.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 4324 bytes