Malicious PDF — malware analysis report

Static analysis result for SHA-256 1208b9ad32eb3b09…

MALICIOUS

PDF

87.5 KB Created: 2021-04-03 12:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b38e07a9473998ac50fb05e86617fcf SHA-1: 7829e5863efd2615eac043d9fdd297635d3c2fe0 SHA-256: 1208b9ad32eb3b09cb7424f279e438dc4e0363718edb3dc136f3f27d106360ad
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of embedded external links, a common technique for SEO spam or phishing campaigns. The primary URL identified is https://kuzutuzo.ru/strik. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=what+is+the+gospel+of+mary+magdalene
    • http://tesupelaj.sportsontheweb.net/bsc_civil_engineering_syllabus.pdf
    • http://50offstore.info/lotigigijap6t78s.pdf
    • http://xovitixekewelom.scienceontheweb.net/tratados_internacionales_en_materia_laboral.pdf
    • http://tadidavazutopa.sportsontheweb.net/animator_vs_animation_card_game.pdf
    • http://marifivelaj.mygamesonline.org/xenulobed.pdf
    • http://mejuvepofejumis.iblogger.org/is_swiffer_wet_jet_ok_for_laminate_floors.pdf
    • http://axacheat4.xyz/antigone_by_sophocles_citationlrpol.pdf
    • http://lesagotefawa.22web.org/79016423956.pdf
    • http://sawubibud.iblogger.org/canara_bank_loan_form.pdf
    • http://fadewujetenuve.mywebcommunity.org/pusebenozixifewisopine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wejufutaz.onlinewebshop.net/calendar_2020_june.pdf
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_b62754e46d8f4a89b91a1d0ebf8627ba.pdf?index=true
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_8d3621b8ed3c49a6beef5c682a8b6af7.pdf?index=true
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_3f263869ee5149d689a694a9dcc6e28b.pdf?index=true
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_5f928750510e40708d68992e8c1e67e7.pdf?index=true
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_50d73a2da2e94f3cb94c2502e039e10b.pdf?index=true
    • http://bipegokatif.onlinewebshop.net/woforosuturijidilator.pdf
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_f69fd7a35a8d46339f49ffefa349be9c.pdf?index=true
    • http://japinoxizidunub.myartsonline.com/66460846612.pdf
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_5ca44bbdf0b24eb38b63531a3e02a17c.pdf?index=true
    • 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_off00011622.bin
1af8adcea457be1e64d5a4343fd2c20f5740601f111596b9097335265db89881		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 5568 bytes
font_01_sfnt_off000128fc.bin
1c947c1da03684db78b868655fcac78a99cdd03bd24a8b98c284c7100b74a113		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 11348 bytes

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