Malicious PDF — malware analysis report

Static analysis result for SHA-256 894a4388ab56494a…

MALICIOUS

PDF

77.5 KB Created: 2021-03-30 22:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89e5a0a81a967a7f3a887519dc2c1caf SHA-1: 199592f317ab4f504c73b6ed6e0dd627a3c4c8bf SHA-256: 894a4388ab56494a3bd9f1b2dd0cef4f428ce6726d8413e189cf47b51daff016
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to potentially harmful websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://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_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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