Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b1e09c177dad44…

MALICIOUS

PDF

96.4 KB Created: 2021-05-01 16:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9913fc140b837c87372e38c6b4a47f8a SHA-1: 688cd1c4d0f832b0fa78dede1c1d95e6f4adaa07 SHA-256: 93b1e09c177dad444f486f52c71aa5b8987e62c1790d50d9f2d404c09080e76b
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=argumentative+essay+samples+pdf
    • http://mananeje.66ghz.com/deziwidugikukenorimu.pdf
    • http://nefozufovi.scienceontheweb.net/jabowunogobebeviratem.pdf
    • http://pisufixefonof.scienceontheweb.net/breast_cancer_project.pdf
    • http://salizurewaki.mypressonline.com/canciones_de_guitarra_para_principiantes.pdf
    • https://cdn.sqhk.co/supesuvepo/ehbgjie/22409700909.pdf
    • http://kofojoxake.mygamesonline.org/asta_fantacalcio_2020.pdf
    • https://cdn.sqhk.co/jurufovowufu/BSugfhf/unofficial_tips_for_resident_evil_3_nemesis.pdf
    • http://rowowesofazov.medianewsonline.com/simone_de_beauvoir_libros_gratis.pdf
    • http://dekovag.mypressonline.com/korolizonamezefenajexo.pdf
    • http://xebubux.sportsontheweb.net/34528794593.pdf
    • http://tomorubi.22web.org/bahubali_1_songs_telugu.pdf
    • https://cdn.sqhk.co/xewimoziwuvo/ghXWhaa/can_t_open_camera_app_windows_10.pdf
    • https://cdn.sqhk.co/linidivez/Qjj6idy/fuseritegigaguwezaxozi.pdf
    • http://tuwukadinem.mygamesonline.org/power_of_information_technology_and_communication.pdf
    • http://sutobep.getenjoyment.net/60235514478.pdf
    • http://rijoginijamibeg.mypressonline.com/65835167374.pdf
    • https://cdn.sqhk.co/mozozezowos/8jibhjG/79252976150.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bokarorozu.rf.gd/automower_310_manual.pdf
    • http://wutejaxevewef.myartsonline.com/hollander_parts_interchange_books.pdf
    • http://totawuvibewe.rf.gd/huskee_lawn_mower_parts_near_me.pdf
    • http://titugol.atwebpages.com/wozotez.pdf
    • http://fedonefekipide.myartsonline.com/seven_years_lyrics_natalie_merchant.pdf
    • http://dadonugila.rf.gd/what_did_thanos_say_before_he_snapped_his_fingers.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_off00013a2c.bin
9297b3f32fe48c610013acd8095b5849d3ea7a15193e677329955f53efe48bfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2C 5512 bytes
font_01_sfnt_off00014ce5.bin
3744d0d9b70d2827738e10393654dcf7c833b7cf9764e87601d61977015a3d67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE5 10988 bytes

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