Malicious PDF — malware analysis report

Static analysis result for SHA-256 a049cbdf37a7684f…

MALICIOUS

PDF

82.6 KB Created: 2021-04-01 16:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 50f945d3cfffe114671dd000691ac874 SHA-1: b6a1caabb9077e55c07e56ef7a71998beff533fb SHA-256: a049cbdf37a7684fe798d981b09fdde780286b3c962252efec4e8854c2e523c9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are presented as search results for educational materials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics further supports a pattern of luring users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://vilenefex.ru/award?keyword=cbse+mathematics+book+for+class+4+pdf PDF link annotation
    • http://rifijetuvijilam.medianewsonline.com/64272882308.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/hJ8hchg/1457723046.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/il_bergsonismo_e_altri_saggi.pdfIn PDF document text
    • http://drovazvenigorod.ru/exercicios_de_ingles_simple_presentqs5nt.pdfIn PDF document text
    • https://cdn.sqhk.co/turogepufe/jhaihhe/calibration_of_uv_spectrophotometer_procedure.pdfIn PDF document text
    • http://jelusuvobirolen.mywebcommunity.org/zebop.pdfIn PDF document text
    • http://kamini33.ru/lunonalevekobkei65.pdfIn PDF document text
    • http://eurozone.pro/tegibapadie1kg8.pdfIn PDF document text
    • http://bluhgang.best/how_much_do_trampoline_parks_cost7ra3k.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/what_is_a_trial_lawyer_salary.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/assignment_abroad_times_newspaper_download_today_3_august_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/hiieiaz/44874964786.pdfIn PDF document text
    • http://useplafond.xyz/jowevelimufaj44i.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/fYhdJii/sultan_s_armed_forces.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://guvukexapa.rf.gd/17498219367.pdfIn PDF document text
    • http://bologipegokofi.epizy.com/zaganurogajetexosu.pdfIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/breeding_show_guppies.pdfIn PDF document text
    • http://varirojemixu.myartsonline.com/89227799201.pdfIn PDF document text
    • http://fenigubigona.epizy.com/chooriyan_pakistani_movie.pdfIn PDF document text
    • http://padegijogul.atwebpages.com/bobina_de_tesla_funcionamiento.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/73497278927.pdfIn PDF document text
    • http://buwumipulufi.epizy.com/aopc_docket_sheets_pa.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/77166168182.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/26723774213.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/dungeons_and_dragons_monster_manual_5e.pdfIn PDF document text
    • http://noporotosodapo.epizy.com/79857714148.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/89911820857.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 5592 bytes
SHA-256: 82e4c77a468a7e1112b503791ebe6b58fc49e4a647ecb3c16b2b9fdb8fc57607
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 11152 bytes
SHA-256: 85966f669b5e578bc76e05ae5f97cb63e2baa1f0e4edb2d7362ce667eb43720c
font_02_sfnt_off00012640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12640 6300 bytes
SHA-256: 9f68929e5542df6f274853868b897b97ecd823bcf7dd5ed976a8d0f355b0ac8f