Malicious PDF — malware analysis report

Static analysis result for SHA-256 9303cba5d194da9b…

MALICIOUS

PDF

70.9 KB Created: 2021-03-02 23:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6a4cf45c955dac4b2a817f290fb9f9a9 SHA-1: 6fe559ffcd7b395e8489157b2ca28c22496ee0c5 SHA-256: 9303cba5d194da9bc11f0ce9a7b43fd3d0efd7b9da9cbb3e4d680377818c13de
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('botokaw.ru') and another to a link farm hosted on disposable domains, suggesting it's used for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://botokaw.ru/strik?utm_term=2002+kawasaki+prairie+400+4x4+parts PDF link annotation
    • https://cdn.sqhk.co/wumerelup/hijgc5n/weebly_games_soccer_heads_championship.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/hp_pavilion_dv6000_drivers_windows_10_64_bit.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/what_is_another_name_for_the_sensory_receptor.pdfIn PDF document text
    • http://maslovauto.ru/megavamarusxdl8y.pdfIn PDF document text
    • http://belixawotid.66ghz.com/xubazofidamonekopok.pdfIn PDF document text
    • http://reznitskygallery.com/telerik_reporting_datasource3bg18.pdfIn PDF document text
    • http://jushq.club/ncees_pe_exam_registration_datesxd0tt.pdfIn PDF document text
    • http://bunnygummy.ru/singular_and_plural_irregular_nounsmevf8.pdfIn PDF document text
    • http://fafikup.scienceontheweb.net/can_i_get_adobe_premiere_for_free_as_a_student.pdfIn PDF document text
    • http://soldatskaya6.ru/actualizar_whatsapp_gratis_androidm1o7g.pdfIn PDF document text
    • http://bilet-pdd.site/antipsychotic_drugs_listnirwm.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/jagomolizobomojukizi.pdfIn PDF document text
    • http://flowerport.market/fuminepajixesolisb6hlp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapewujekim.epizy.com/86147037809.pdfIn PDF document text
    • http://foripoj.epizy.com/meeting_attendance_sheet_excel_template.pdfIn PDF document text
    • http://lajoxugulip.epizy.com/how_to_get_more_furniture_recipes_animal_crossing.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_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 5272 bytes
SHA-256: 940cf1e1833209a79b7bd75b7a842a0bd06efb1b6e61dd9fb7353ff3a539ac62
font_01_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 10716 bytes
SHA-256: ecd2ab3607f585f0345c8ea13a8adf9d85600773aa0e321d0cf20a3a79eb5a07

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