Malicious PDF — malware analysis report

Static analysis result for SHA-256 53aba2f554ecfe84…

MALICIOUS

PDF

87.5 KB Created: 2021-05-16 06:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2afcd360bd601d8cacb9cf92d5b02332 SHA-1: a61e8968463bc148864a65059f24a1d1186762ec SHA-256: 53aba2f554ecfe84fb3f9e7b4ca9298c89180b7685795cda1b13d36ee2e5f667
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, 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 for phishing or malware delivery. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=la+leccion+de+august+personajes+pelicula PDF link annotation
    • http://jesurave.22web.org/introduction_to_criminal_justice_system.pdfIn PDF document text
    • http://zelopaqq.xyz/94472901189cdobm.pdfIn PDF document text
    • http://pikejofopon.mypressonline.com/dibrugarh_university_bsc_mathematics_major_syllabus.pdfIn PDF document text
    • http://study-english-04.space/basketball_stars_apkuh2sb.pdfIn PDF document text
    • http://enots.space/bubenonosodjzqm1.pdfIn PDF document text
    • https://zuxaminuxux.weebly.com/uploads/1/3/4/6/134652083/satixapugixiramonabi.pdfIn PDF document text
    • https://mikofamix.weebly.com/uploads/1/3/4/8/134882663/gajetasab.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/jWjeSKx/big_baby_dram_broccoli_download.pdfIn PDF document text
    • https://xobuwepowitapim.weebly.com/uploads/1/3/0/7/130775805/mazanapak_wopowuzu_xenomo.pdfIn PDF document text
    • http://desokore.medianewsonline.com/how_to_become_an_interior_designer_in_australia.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/3268183420371ixm.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/avadhanulu_engineering_physics_download.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/csheicY/20195404116.pdfIn PDF document text
    • http://weinmvc.net/arkansas_drivers_license_requirementshd06m.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/lds_2020_general_conference_dates.pdfIn PDF document text
    • https://fukenotaza.weebly.com/uploads/1/3/2/7/132740373/fawugovifutodimake.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/36062055830.pdfIn PDF document text
    • http://zijaditenup.getenjoyment.net/catic_catecismo_de_la_iglesia_catolica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sajavisazoz.epizy.com/havering_6th_form_ofsted.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/vendor_risk_management_framework.pdfIn PDF document text
    • http://xuvafinuvewabek.epizy.com/maroon_5_girl_like_you_sheet_music.pdfIn PDF document text
    • http://ponadimajuv.epizy.com/astm_a572_standard.pdfIn PDF document text
    • http://patudesaruvob.atwebpages.com/how_to_reset_epson_xp_320_printer.pdfIn PDF document text
    • http://wodagewuxaver.rf.gd/99493982300.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 5256 bytes
SHA-256: 9c6391692c0399b587d43bfbd7e7c5de741ca168c9b7a3b0239af3236e922be6
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 4532 bytes
SHA-256: 7809b38205514efd75af80c6118fe1d93f295af1948fbda30e98339d93be29c6
font_02_sfnt_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 12468 bytes
SHA-256: a6f4758c44749f35437825a25a568970734143b56e78cb8d58f0b76002fbb227
font_03_sfnt_off000136ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AC 17192 bytes
SHA-256: 27debbba9f9bcf2ec360c70e0e9f12ad7b0a240f114fb8eb9ae2b770ca3dca2d