Malicious PDF — malware analysis report

Static analysis result for SHA-256 79329686d6813030…

MALICIOUS

PDF

84.5 KB Created: 2021-03-16 16:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 83ebf713fabe1ae6e3102320e3496935 SHA-1: d5488ceb52ac7aad75900117e260bd487c4a3bb1 SHA-256: 79329686d68130303a0d1e096de153b127f54e0ab6deae418d83650fc89ed11a
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. 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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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=maze+runner+4+trailer+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/nokulebepoba/Lhtiejd/xavix.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/iOjdhiK/wufasuja.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/hg19jgh/7080257084.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/ihhasgc/download_free_flowchart_app.pdfIn PDF document text
    • http://5coupons.info/nevojonegasait0sf.pdfIn PDF document text
    • http://basiditdcf.space/vasejafemapafexragbm.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/bajhYSq/armageddon_song_list.pdfIn PDF document text
    • https://cdn.sqhk.co/jetuzama/1Hienia/3680188695.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/FJgcJhh/36882636137.pdfIn PDF document text
    • http://tersq.fun/computer_networking_basic_questions_and_answersimykr.pdfIn PDF document text
    • https://cdn.sqhk.co/guletema/gcsmbQE/formule_calcul_tva_collecte.pdfIn PDF document text
    • http://power-guard.shop/casio_calculator_watch_change_military_time80c7r.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/cldibhd/ribirufurow.pdfIn PDF document text
    • http://xsale.trade/sheikh_albani3fe5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gekojulog/is_kanban_agile_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7703ffd5-d93f-4ee1-8639-4f295d8fba46/regozuditejodelad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4396cd3c-6702-4883-810a-51c7c0df1018/what_is_a_computer_server_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0596d5a9-9141-442c-a389-860fb327e640/wudodimowawapaj.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/wupabateva.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 5168 bytes
SHA-256: 5220fd9921a21dab97b721d3ec139b3a8546ea753cd62bbaefe14e12639c2c28
font_01_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 12496 bytes
SHA-256: d3a4a48a7b0075f2cdb2000ae33b7a393455ce3bad9005f01a9b58fa87f207fb

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