Malicious PDF — malware analysis report

Static analysis result for SHA-256 05326783be42a0c0…

MALICIOUS

PDF

78.0 KB Created: 2021-04-16 02:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a94b3f216098ceffd154a6ca8cf044ce SHA-1: 5161b62cfdf038073c3df0fb1fb37fdd75be077a SHA-256: 05326783be42a0c09965f23a95775e36da9295394df19af116d099786a22c6fe
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary URL, https://baarspo.ru/strik, is likely the final destination for the campaign, possibly serving a phishing page or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/strik?utm_term=can+cbt+treat+depression
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5fd36e000ef77.pdf
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/19077fc932e1a.pdf
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/pifawunajiteselori.pdf
    • https://kabuvegezukab.weebly.com/uploads/1/3/5/3/135325093/govuruperuvuxawuf.pdf
    • https://static.s123-cdn-static.com/uploads/4421050/normal_5fc9aba55b895.pdf
    • https://static.s123-cdn-static.com/uploads/4421330/normal_5ff281351a036.pdf
    • https://fuvapele.weebly.com/uploads/1/3/0/7/130738919/lotuvo-nokol-wijuvef.pdf
    • https://bepevefobe.weebly.com/uploads/1/3/4/6/134699504/kojasilu_dulozupafu.pdf
    • https://cdn-cms.f-static.net/uploads/4366947/normal_602ab1cbb0ac1.pdf
    • https://nuvosukive.weebly.com/uploads/1/3/4/7/134718285/5653288.pdf
    • http://expressday.online/78444841442l12e3.pdf
    • http://buloshnaya.site/game_one_piece_bounty_rush_engxzhow.pdf
    • http://spainsale.pro/zosalelokederizovonedoragt0s6.pdf
    • http://dfahsdfgjsfg.online/el_seor_de_las_moscas_resumen_capitulo_30744v.pdf
    • http://creditreportusa.info/how_do_i_remove_old_google_accounts_after_factory_reset_android7f3dn.pdf
    • https://kexanitafax.weebly.com/uploads/1/3/0/8/130813084/615a52c7a7012.pdf
    • https://valetapos.weebly.com/uploads/1/3/4/2/134265584/3258bf83.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dinigugaxej/uscis_citizenship_form.pdf
    • https://s3.amazonaws.com/lazesej/kafka_1922_short_story.pdf
    • https://s3.amazonaws.com/xopugup/bitwise_operators_in_java.pdf
    • https://s3.amazonaws.com/setikizo/antenatal_care_guidelines_rcog.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29c.bin
929d7f56459edf927c60b89caa75877905d5d435459c7fe0154799af8e6d4479		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 5080 bytes
font_01_sfnt_off000103e2.bin
d48b4384ebf30aa4e1edbdd0da0fa054ee28422f0c43953dd55475c6c54ff589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 10812 bytes

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