Malicious PDF — malware analysis report

Static analysis result for SHA-256 200f1113dbe6da7f…

MALICIOUS

PDF

79.1 KB Created: 2021-03-19 17:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2764c48b5418c60c24e4daf868e0153c SHA-1: b116118f217fb311732d1a0e3e3510022e8e9a86 SHA-256: 200f1113dbe6da7f850c6c80d89dcd58beac5a5007c3e19ad6ee2b894df169b5
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to distribute malicious content or phish users. The primary malicious URL identified is https://xajibur.ru/strik, which is likely the final destination for the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=what+is+my+native+american+spirit+animal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467912/normal_5ff85b3353d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_602de089b8acc.pdfIn PDF document text
    • http://titoto.xyz/joining_report_letter_after_earned_leavec01e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424933/normal_601a1b6df1744.pdfIn PDF document text
    • http://clubstore.pro/infinix_note_8i_price_philippines_2020hhq2e.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/2017_ktm_duke_390_owners_manual.pdfIn PDF document text
    • http://detonic-italy.website/new_characters_warriors_orochi_4yxoax.pdfIn PDF document text
    • http://dozixolabizije.iblogger.org/case_files_pediatrics_6th_edition.pdfIn PDF document text
    • http://vehicleusains.com/automotive_technology_a_systems_appruh0j6.pdfIn PDF document text
    • http://limevekobo.iblogger.org/baaghi_full_movie_free_mp4.pdfIn PDF document text
    • http://citimart.online/minecraft_version_1._6_4_forgemhnjb.pdfIn PDF document text
    • http://trujillostacoshop.com/748462101238r6ed.pdfIn PDF document text
    • http://ibkreactiva2020.com/beard_styles_2020_for_bald_guysrqq4h.pdfIn PDF document text
    • http://hookup682.site/ingles_basico_de_conversacionmppo0.pdfIn PDF document text
    • http://selitir.iblogger.org/drum_programming_tutorial_fl_studio.pdfIn PDF document text
    • http://wwnews.site/era_cenozoica_unamuwc4u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423715/normal_5ff2171216c0a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fevejalamozek.epizy.com/44075980899.pdfIn PDF document text
    • http://kurivixudenetiw.epizy.com/chinese_language_textbook.pdfIn PDF document text
    • http://kopolug.myartsonline.com/93227416507.pdfIn PDF document text
    • http://jafojib.rf.gd/54703157128.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/90855060712.pdfIn PDF document text
    • http://vunefukovamin.rf.gd/replacement_battery_for_panasonic_es-la63.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_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 5348 bytes
SHA-256: 5474cf73e4991afdfe310b4bc3a466ec88855797f8779757ffad7075e74e2dbd
font_01_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 10696 bytes
SHA-256: d66fff848fedd0b4b3b33e747b8c845c8007de497902f34135a08cb5b89a0cbf

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