Malicious PDF — malware analysis report

Static analysis result for SHA-256 789efdd39fa12daf…

MALICIOUS

PDF

79.8 KB Created: 2021-03-28 11:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d0ea79c437979ae6196472a3523044ee SHA-1: ab852ac1d4ec0186bc35259c3d750398a16403f7 SHA-256: 789efdd39fa12daf9d86ffcd6a7d163776eea74ece4226aeb4bd585dc1918504
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a 'Boston fish market menu pdf', likely to trick users into clicking the malicious URL.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=boston+fish+market+menu+pdf In PDF document text
    • http://gazagidumow.mygamesonline.org/tevebimukemazixip.pdfIn PDF document text
    • http://kuvenumine.mygamesonline.org/dungeons_and_dragons_books_near_me.pdfIn PDF document text
    • http://bavakobo.iblogger.org/nespresso_aeroccino_plus_milk_frother_manual.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/mevofiwatudota.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/craftsman_5_hp_chipper_shredder_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widiku/70283824486.pdfIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_7a631fb992fd407f8dc74372609dc06e.pdf?index=trueIn PDF document text
    • http://ribaxexumipo.rf.gd/25314847395.pdfIn PDF document text
    • http://tufifexafepo.epizy.com/72118733294.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_c75810ad8bd34f82819fe3e8bfad7da5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b76d54-146d-47a2-850d-e08652eeac0b/juegos_de_hombre_araa_en_moto.pdfIn PDF document text
    • http://ronageze.rf.gd/payment_of_gratuity_amendment_act_2020.pdfIn PDF document text
    • http://regipegor.rf.gd/6833325644.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/chicago_style_bibliography_page_format.pdfIn PDF document text
    • http://buvuvutokitiz.epizy.com/57741608020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b15b9b4-0865-415d-a57d-9b71f9cf4771/pukajosemotatopigexexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aab7cd3-cb49-4615-b204-853c241b0e9b/gossip_girl_the_wrong_goodbye_cast.pdfIn PDF document text
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_e8b197326c9749f68db799eaa4fa82c7.pdf?index=trueIn PDF document text
    • http://bijalefopate.rf.gd/rebinolagefejuzitexafe.pdfIn PDF document text
    • http://zipodanej.rf.gd/vigusejamosawelo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 5360 bytes
SHA-256: 8787725b91cb27f4373e9c0518726d4b62fee5c828aa0f5e47364510e28ecfce
font_01_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 11716 bytes
SHA-256: a16f598a078679633f02de4605013d33a1b1bec5d6109f8552dd438f4f92666c

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