Malicious PDF — malware analysis report

Static analysis result for SHA-256 5688bef7d31c1088…

MALICIOUS

PDF

75.2 KB Created: 2021-02-26 16:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 146a7fe637ed739bf52721145e1a99ca SHA-1: a300157d0832d03b453f2819c46aaf4a928ad22f SHA-256: 5688bef7d31c1088ad095ffcd81cfe3e070b3d4576de0c1f6c2a2131df5e76bf
66 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://nipisod.ru/wb?keyword=surah%20al%20mulk%20full%20reading', is presented as a search result, likely to trick users into visiting a malicious site. While no scripts were explicitly extracted, the ML classifier strongly indicates malicious intent, and the PDF structure itself is designed to host many links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://nipisod.ru/wb?keyword=surah%20al%20mulk%20full%20reading PDF link annotation
    • http://xuxetosufuzo.getenjoyment.net/24_month_milestones_ontario.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/jiduzitixulivipiriki.pdfIn PDF document text
    • https://fusajowaxoxa.weebly.com/uploads/1/3/5/3/135344195/535aa9403995.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/solving_quadratic_equations_by_graphing_worksheet_answers_algebra_2.pdfIn PDF document text
    • https://mivewuwadomabat.weebly.com/uploads/1/3/1/6/131606259/9cb2daf926b8.pdfIn PDF document text
    • http://sberpodarok2020.online/neretomefeu2eyn.pdfIn PDF document text
    • http://rimka.xyz/c_initialize_static_member_of_template_classegti4.pdfIn PDF document text
    • https://vezitiratad.weebly.com/uploads/1/3/1/8/131856143/8564463.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/is_bbg_good_for_runners.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/tawovojo/microfleece_sheets_target.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/fuzefukezagubozirowu.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/what_is_scientific_method_summary.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/dexixik.pdfIn PDF document text
    • http://gedesopow.rf.gd/bukuvulog.pdfIn PDF document text
    • http://bowupezik.epizy.com/apocalypto_movie_online.pdfIn PDF document text
    • http://madoduv.epizy.com/sunforce_solar_motion_80_led_security_light.pdfIn PDF document text
    • http://lokatetaf.rf.gd/866622206.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/podudijafop.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/bhakta_kumbara_kannada_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/67954362364.pdfIn PDF document text
    • http://vekalaluno.epizy.com/hydrostatic_pressure_lab_report.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_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 5308 bytes
SHA-256: ef161cb42a07731d552647d6cf0fbc849777e9fb0fb53e657e473f2c3483c283
font_01_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 10556 bytes
SHA-256: b164e12f642ad89b1432c9badc57f878bf948585063c5611060209fd28fe6e68

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