Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efc790b0aa115d6…

MALICIOUS

PDF

79.1 KB Created: 2021-04-09 09:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7059148d1045357356e45674f1bf4db4 SHA-1: 56d0bdba569a0090bf8346d8e3ae539a0f9b03d8 SHA-256: 7efc790b0aa115d68770ee53bc084d2de6beddc2f43ec2f937d6f58e14442227
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=las+principales+equivalencias+de+unidades+del+sistema+internacional+al+sistema+ingl%25C3%25A9s PDF link annotation
    • https://suxapenogabako.weebly.com/uploads/1/3/4/6/134602080/507dcc60d2.pdfIn PDF document text
    • http://jurisel.iblogger.org/towezovituv.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/rowagegevaridu.pdfIn PDF document text
    • https://cdn.sqhk.co/tokotuxajif/jaLhcia/gerowekomizegem.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/delonghi_toaster_review_nz.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/0jchfXN/gipiwisisibowu.pdfIn PDF document text
    • https://roxowuvunesoneb.weebly.com/uploads/1/3/4/8/134889799/rejebabanavanigi.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/gjichdc/42610864483.pdfIn PDF document text
    • http://astrology-personal.online/zosogujasebezigabobabvuds.pdfIn PDF document text
    • http://eagleaff.com/29787687781l5vgx.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/paisabazaar_credit_score_password.pdfIn PDF document text
    • http://health-top.ru/xumabo5ixc.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/RXPNPhi/lidelogif.pdfIn PDF document text
    • http://pebunoguge.mygamesonline.org/nerunezo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jedikofip.rf.gd/how_to_overcome_tragedy_of_the_commons.pdfIn PDF document text
    • http://gumizaxewa.atwebpages.com/24839330002.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/will_the_book_red_queen_become_a_movie.pdfIn PDF document text
    • http://josekopiguvalup.epizy.com/degajejolapukojibixiditot.pdfIn PDF document text
    • http://posijibanif.epizy.com/motorola_apx_4000_charger_user_guide.pdfIn PDF document text
    • http://niselasot.atwebpages.com/anganwadi_form_download_mp.pdfIn PDF document text
    • http://jezedor.epizy.com/curriculum_vitae_europass_format_word.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_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 5664 bytes
SHA-256: 832371b56468d403eced008c28d23ac17887ecf846c0fc332073adb14312a198
font_01_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 11872 bytes
SHA-256: d85d4bb03e92e46f6545f761ad638608f1944d6a46e1193fb60ae88c8b7b2f5f

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