Malicious PDF — malware analysis report

Static analysis result for SHA-256 780aaf60bd5e0d87…

MALICIOUS

PDF

69.4 KB Created: 2021-03-15 06:23:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 50e1ee6941f1013745c4d6741de45961 SHA-1: 97016144c4c617dbaabad865510524a380f22b75 SHA-256: 780aaf60bd5e0d8714fff04510bd922ab1e6c764592765959e91f09caa9b38cf
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as https://maypoin.ru/strik?utm_term=libro+de+problemas+de+balance+de+materia+y+energia+antonio+valiente+pdf, are likely used to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic findings suggest it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/strik?utm_term=libro+de+problemas+de+balance+de+materia+y+energia+antonio+valiente+pdf PDF link annotation
    • http://ighelperscenter.com/math_worksheets_for_middle_school4ckjw.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/TXhdif2/slime_pizza_sweatpants.pdfIn PDF document text
    • http://lolkek.xyz/zoom_h4n_vs_h4n_prod5wb2.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/wewukopo.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/how_to_lose_weight_eating_3000_calories_a_day.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/24378365569eds7r.pdfIn PDF document text
    • http://vigastlens.xyz/cestina_express_2j1e27.pdfIn PDF document text
    • http://lofoporubatul.mygamesonline.org/26561752449.pdfIn PDF document text
    • http://meetraisins.club/disney_pixar_brave_movie_freebzfck.pdfIn PDF document text
    • http://100p-f.ru/56399141880mgsub.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/82039886564ap803.pdfIn PDF document text
    • https://cdn.sqhk.co/bedipidis/Fgdjaii/52320739199.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/casio_g-shock_ga-100-1a1dr_g270.pdfIn PDF document text
    • http://brosbass.com/watch_the_motorcycle_diaries_online_freehjerm.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/vishnu_sahasranama_namavali_in_kannada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d427f8-4e56-40cc-a156-022f561d63ef/fugl_meyer_scale.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/why_does_my_compressor_not_build_up_pressure.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/singer_quantum_stylist_9960_price_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14dcff90-914a-4987-8689-5915bc691936/preguntas_y_respuestas_del_capitulo_3_del_caballero_dela_armadura_oxidada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/175ebcd9-b6ea-4a67-99eb-4a01426cee02/farberware_air_fryer_toaster_oven_fried_chicken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ecbcac-ef1d-421c-b9e6-aef69414ae71/how_the_holy_spirit_is_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bb73925-334a-484e-8637-c0d14a0a8acc/20323214800.pdfIn PDF document text
    • http://jemileti.atwebpages.com/does_starbucks_health_insurance_cover_therapy.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_off0000cd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3D 5716 bytes
SHA-256: 0211e37dc132c4a823cd4ddb5f8ed9b56e958241e9e00682dd6b726ebf88fcf0
font_01_sfnt_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 11248 bytes
SHA-256: a8f3724685c9f32de7c95e0e274698c641b8e11f959995c376d604790a9cf5bf