Malicious PDF — malware analysis report

Static analysis result for SHA-256 262b5dca2babe0f8…

MALICIOUS

PDF

76.3 KB Created: 2021-03-30 22:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21faf5c9377d211583cd37562ba5032f SHA-1: 0e586937697881256d83aef3adbd3e8c705e4842 SHA-256: 262b5dca2babe0f8adb40fc9013d20e4cae84e8f2cf5900ed096e11485b1a736
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains multiple embedded URLs. One URL, 'https://jacksth.ru/award?keyword=tax+administration+act+1994+pdf', is directly referenced by a PDF_URI heuristic, suggesting it's a primary lure. The document body, though heavily obfuscated, contains text related to 'tax administration act 1994 pdf', reinforcing the phishing pretext. The presence of numerous links and disposable hosting suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://jacksth.ru/award?keyword=tax+administration+act+1994+pdf
    • http://tatewuf.iblogger.org/what_would_jesus_eat_book.pdf
    • https://cdn-cms.f-static.net/uploads/4384464/normal_604d6dfa091e7.pdf
    • http://peteferix.mypressonline.com/20366999789.pdf
    • https://static.s123-cdn-static.com/uploads/4469106/normal_5ff9fab40223b.pdf
    • http://sekelenogake.getenjoyment.net/listening_skills_practice_llamas_exercises.pdf
    • http://memisada.mygamesonline.org/nujabifokemomaguriguweja.pdf
    • http://sowinod.mywebcommunity.org/rulotix.pdf
    • https://cdn.sqhk.co/fejavegiwo/icv7jhH/fiji_airways_sydney_office_phone_number.pdf
    • http://rumagadoli.22web.org/jifuzufaz.pdf
    • https://cdn.sqhk.co/sarunasol/hnijygj/easy_optical_illusions_to_draw_step_by_step.pdf
    • http://suvolupijiro.mygamesonline.org/34405894963.pdf
    • https://static.s123-cdn-static.com/uploads/4413362/normal_5fe08dcd18a7c.pdf
    • https://cdn-cms.f-static.net/uploads/4492574/normal_606026df6e2be.pdf
    • https://cdn.sqhk.co/zuzudumijamo/OFWjgNk/h_band_watch_instructions.pdf
    • http://mitutepoka.medianewsonline.com/pejumerogedevarewo.pdf
    • https://static.s123-cdn-static.com/uploads/4423780/normal_5fef0ccbdfff7.pdf
    • https://cdn-cms.f-static.net/uploads/4414678/normal_604d2e57ebe3c.pdf
    • http://gudazugaxogipo.22web.org/cascada_de_coagulacion_2019.pdf
    • https://static.s123-cdn-static.com/uploads/4463552/normal_5ff6690429d9f.pdf
    • https://static.s123-cdn-static.com/uploads/4368762/normal_6009252987605.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nufiwimuzobo.onlinewebshop.net/12428847702.pdf
    • http://kazigolukujo.epizy.com/booklet_template_pages.pdf
    • http://mukanebesiva.atwebpages.com/645155920.pdf
    • http://jajogagek.atwebpages.com/anatomy_of_liver_and_biliary_system.pdf
    • http://tosivasode.epizy.com/analogias_numericas_ejercicios_resueltos.pdf
    • http://xuvuzonixo.onlinewebshop.net/edit_file_free_software.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee71.bin
62ea7c6753a05b582fde2eadb2fa51d1f9dff02f9d1a0eb1732bedf12f20f526		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 5584 bytes
font_01_sfnt_off00010165.bin
3e29d81d464edc5d244ce2e6be16435df44855b889582ef0be2699237ae7ea09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 10956 bytes

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