Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ee42ba13cd3c80…

MALICIOUS

PDF

114.0 KB Created: 2021-03-12 15:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7b43715acd70122ebe47a15c5609c2b3 SHA-1: 568358e99318bb30e1c1379576b579d38bce4776 SHA-256: c9ee42ba13cd3c80aed46edf23589d1ab3bc03cbe0ebf327d0e7c1e8f97f6df9
166 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a password-protected archive lure and a link farm on disposable hosting. The embedded URLs suggest an attempt to redirect users to download further malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/123?utm_term=harry+and+his+bucketful+of+dinosaurs+pdf PDF link annotation
    • https://cdn.sqhk.co/gixedomawa/hcRgjhc/snickers_ice_cream_cake_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/Sgaqkjf/23357816317.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/eMidtOB/olympic_archery_games_online_free.pdfIn PDF document text
    • http://frukt.fun/ancillary_probate_california_formsi17tj.pdfIn PDF document text
    • http://milano-moda.space/tiny_battle_simulator_indir33imx.pdfIn PDF document text
    • http://batinaba.22web.org/takabowosurexomu.pdfIn PDF document text
    • https://cdn.sqhk.co/zugivakizo/IEQhjhi/haggis_bashers_ball_anchorage.pdfIn PDF document text
    • http://labakugolav.iblogger.org/sex_offender_registry_utah.pdfIn PDF document text
    • http://wuroguredogir.getenjoyment.net/89491894569.pdfIn PDF document text
    • http://bubble1.space/922901946930hzky.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/xazarujokemus/mewogetiwiwagajilukidam.pdfIn PDF document text
    • http://jixepewix.epizy.com/dynamics_365_portal_templates.pdfIn PDF document text
    • http://depegiwisa.epizy.com/ethiopian_reporter_vacancy.pdfIn PDF document text
    • http://taberadajip.atwebpages.com/nespresso_aeroccino_3_cold_froth.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/tiwisaxewenijule.pdfIn PDF document text
    • http://pukewideje.epizy.com/61265700959.pdfIn PDF document text
    • http://tenowuwewid.epizy.com/gokizunax.pdfIn PDF document text
    • http://xizufelelariru.rf.gd/write_a_two_paragraph_essay_describing_the_aeta_depicted_in_the_photo.pdfIn PDF document text
    • http://faxanudof.epizy.com/maps._me_free_for_windows.pdfIn PDF document text
    • http://rumajajoneder.rf.gd/hp_photosmart_c4580.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_off00018239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18239 5512 bytes
SHA-256: 67b13995aeb007533c5efc4dcef056ef85af3abd134a4488d1a13a8b3db58ddb
font_01_sfnt_off000194f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194F1 10904 bytes
SHA-256: e26ca0b391a9b16b28ff5c49665d2a66a3d4fe40025dea849882a57b8b469c5b

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