Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb4eec770696f49…

MALICIOUS

PDF

85.6 KB Created: 2021-03-29 23:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: caec3a49c42b52d4ce8f1a805345cc40 SHA-1: 69f44949750b64f8cc5d19c9fc1dc097695cacc8 SHA-256: edb4eec770696f495a973d48abf8d39b7fdebc481e8d13118b3599ea380e8e05
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 functions as a link farm on disposable hosting. The embedded URLs point to suspicious domains, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/award?keyword=categorias+y+funciones+gramaticales+pdf PDF link annotation
    • http://jutidewolojura.mypressonline.com/gulf_arabic_english_dictionary.pdfIn PDF document text
    • http://copyrightviolationcenters.com/tabla_de_aciertos_ser_bachiller_2019zgha0.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/best_aeron_alternative.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/fatafutumawifuwidujaxulok.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/womuvamepexemovul.pdfIn PDF document text
    • http://alexsaf.ru/leguvimerekukancfxeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495065/normal_5ffb6d39c63ab.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/joseph_campbell_best_selling_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458837/normal_60082e1e489f0.pdfIn PDF document text
    • http://xibiselid.medianewsonline.com/app_inventor_2_tutorials.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/varicocele_adalah.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/87644904115.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/19865789079.pdfIn PDF document text
    • http://it50off.pro/dell_as501_sound_bar_speaker6146b.pdfIn PDF document text
    • http://pomirkapa.site/lagu_123_wo_ai_ni_planetlaguhkw9u.pdfIn PDF document text
    • http://stikc.xyz/15144897750nto45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444123/normal_5fcea9238ba38.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/xetuxakemofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_5fd66e1667882.pdfIn PDF document text
    • http://bulepozobagepud.mygamesonline.org/cutting_edge_intermediate_student_s_book_third_edition.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/calisthenics_e_bodybuilding.pdfIn PDF document text
    • http://farunoraxukiz.getenjoyment.net/58345465180.pdfIn PDF document text
    • http://gosugas.getenjoyment.net/case_study_research_in_the_philippines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vorisenunajix.myartsonline.com/sulevopibogepuga.pdfIn PDF document text
    • http://bavufupuvamopaf.atwebpages.com/adjektivdeklination_bungen_c1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 5484 bytes
SHA-256: e728c3ebc6932cc17ed1459b3ab11992c921921a7d757a7b41d4e971383b0c06
font_01_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 12660 bytes
SHA-256: ff5aae4dc05878e7329ed17d853126c79d0ded9b72d709b43adad7c420fbbcda
font_02_sfnt_off00013831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13831 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176