Malicious PDF — malware analysis report

Static analysis result for SHA-256 103c8326bab976bf…

MALICIOUS

PDF

79.5 KB Created: 2021-03-18 18:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab4b7112d24a8095345cfb64b560b52a SHA-1: 7b569dc5ec070deea114ef6926a0cc3a07592188 SHA-256: 103c8326bab976bfdeb649d142b7a6108b7d43c83789e162272fc4661f75cac4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious domains, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/123?utm_term=english+thriller+movies+2017+free
    • http://myirn.icu/vutelexo7w4yz.pdf
    • http://vladmer.ru/kitchenaid_7_cup_food_processor_contour_silver_reviewsrvftj.pdf
    • http://voirly.xyz/1877932816043wwi.pdf
    • http://podipotekoi.ru/manuale_shimano_dura_ace_di2_9100ndmua.pdf
    • https://xelixexojiga.weebly.com/uploads/1/3/4/1/134108676/1c23912c8d908.pdf
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/gokatovasonikimoja.pdf
    • http://sarkife.site/vizag_defence_academy_kundanapalli_hyderabad._secunderabad_telanganahkdys.pdf
    • http://begemot.space/international_business_attorney_near_me0cul0.pdf
    • http://exampl1214.com/105983376693dxsx.pdf
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/raxif_fekivinoga_fuzokuwevomuj_xamifi.pdf
    • http://jusapp.club/vefonenualog3.pdf
    • http://erse.xyz/3051871507965rr9.pdf
    • http://sis-paypal.com/flow_chart_in_excel_2007fesxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tujijekaxevon.rf.gd/robaxugagafatexe.pdf
    • http://voxunerejowiz.epizy.com/rowley_diary_of_a_wimpy_kid_actor_now.pdf
    • https://uploads.strikinglycdn.com/files/29916a9f-8cea-4c21-bcf4-04f12468eed6/springboard_precalculus_book_answers.pdf
    • https://uploads.strikinglycdn.com/files/b829f034-f042-4de3-8366-a18960844da6/36524881767.pdf
    • http://pamegapag.epizy.com/phrasal_verbs_exercises_for_class_8_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/6564ebd8-92bb-418a-bc7f-2f06d266ea71/cuales_fueron_los_problemas_que_tuvo_mexico_despues_de_la_independencia.pdf
    • http://xojutavuvexiso.rf.gd/walutuvotawew.pdf
    • https://uploads.strikinglycdn.com/files/9fd459aa-6b73-455c-b4ac-221523125f2d/how_the_bible_speaks_to_us.pdf
    • https://uploads.strikinglycdn.com/files/b0cf6297-1948-4f06-a4dd-46a529b8fbc8/73265391874.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_off0000f8d0.bin
eb4a95780d97a45e31644fac7774a03efdd2e4289a95dc613ed0121d9fb8baf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 5396 bytes
font_01_sfnt_off00010b20.bin
a0fd1daf1899612b25a69d9f9cd5949dc72928bdb9f9d3f3991536a74d1f36cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 11400 bytes

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