Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d9a2d8f51b7f29…

MALICIOUS

PDF

91.2 KB Created: 2021-04-12 20:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdb8a025ab0c6bc4c927b69070e21e73 SHA-1: de86c251699210e05218fe18c008db16ea22aa7f SHA-256: 81d9a2d8f51b7f293ef839b69b90e2750d85d75f9f4c7b604726947cc016fd3f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a lure to external malicious content.

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://seumenha.ru/strik?utm_term=gone+series+full+movie+online+dailymotion
    • http://de-bewertung-id2842384.icu/30659226369afnzq.pdf
    • http://opros.xyz/799654720709vu1t.pdf
    • http://kubumumonal.22web.org/introduction_to_teaching_becoming_a_professional_5th_edition.pdf
    • https://cdn.sqhk.co/vulovosovem/b9jidVj/23778342801.pdf
    • http://devgame.design/zitumijonigadafedarimi27wii.pdf
    • http://goodsun.fun/star_trek_discovery_season_1_plot_holesijzzb.pdf
    • http://devgm.design/highway_racing_car6defr.pdf
    • https://cdn.sqhk.co/zegofurop/gNrsohd/54769413154.pdf
    • https://cdn.sqhk.co/fugolamudara/i4CggPs/vobofevama.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://toxifiv.myartsonline.com/gujarat_map.pdf
    • http://wolaxagemir.rf.gd/skeena_river_test_fishing_report.pdf
    • http://negumigimewote.onlinewebshop.net/how_to_write_a_movie_story.pdf
    • http://doganaxagigub.rf.gd/xetelikix.pdf
    • http://sagunum.rf.gd/shimla_mirchi_full_movie_720p.pdf
    • http://jiditorugap.epizy.com/53839494475.pdf
    • http://segifonaben.rf.gd/ielts_academic_reading_practice_test_with_answers_2020.pdf
    • http://tisajepi.epizy.com/home_health_aide_test_with_answer_key.pdf
    • http://xonifovozub.epizy.com/xufibipumixodamarazopileg.pdf
    • http://xivubijorudi.epizy.com/agriform_sca_cheese.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_off000128ec.bin
afec967d2194ecc10519fc44e372397e0d750a176a8353aaac6aba29740a9e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 5244 bytes
font_01_sfnt_off00013ab7.bin
05f7d5c2555d72c52ed55e0089e808c1a80496e205f35a65be575060fdef7bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB7 10696 bytes

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