Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d609ec2be243c5b…

MALICIOUS

PDF

81.4 KB Created: 2021-04-08 09:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 275dcbdeabc48428059ed94cc5f6e312 SHA-1: 2e7f506da0f4c29f728dc7525ee71dc26e5d4698 SHA-256: 5d609ec2be243c5b9b082d90393e36f8e88e41266c09b740ac4e2a736652f13d
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, appears to be a lure related to Vizio TV models, likely intended to trick users into clicking on the deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://gosoxegekiri.mywebcommunity.org/nadarisibugalawigenuludif.pdf In PDF document text
    • http://gufurebu.medianewsonline.com/corazon_de_nino_sheet_music.pdfIn PDF document text
    • http://disconto50.info/mojiferemg5bg.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/ieGahg6/ama_superbike_2010.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/ahjjfTH/57086386569.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/vuwepademuzisizadirori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_605d65cecd3bc.pdfIn PDF document text
    • http://yourcy.com/jilipegatizedinub8u6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494417/normal_600ef5fad4ea6.pdfIn PDF document text
    • http://xijivedijimidip.mygamesonline.org/bailout_nation.pdfIn PDF document text
    • http://creditpm.com/96218800663joyxb.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/iihibhj/playstation_app_not_working_on_ps3_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/xaxamipuxum/mmIZYgh/rustic_romance_at_bayer_farm_greenfield_ma_01301.pdfIn PDF document text
    • http://tebeririz.scienceontheweb.net/61918095231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_6031e54a582ad.pdfIn PDF document text
    • https://cdn.sqhk.co/gevopobi/jJEEhgc/pesugozuwikinigofapeserub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/0IJhScypsXo/wb?keyword=how%20do%20i%20know%20what%20year%20my%20vizio%20tv%20isPDF link annotation
    • https://uploads.strikinglycdn.com/files/147f7e34-8276-4480-83d5-569ecf07d3d9/totelunebunaxexujexukis.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/adverb_clause_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f93fe1-1d84-492f-b8e0-8cc589047910/the_100_book_4_read_online.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_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 5360 bytes
SHA-256: 488dc7391deca528f49cbfabd00b3266cbfa1e48738e37a2a9c99db874c7d7cd
font_01_sfnt_off00010f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 11716 bytes
SHA-256: cbf15fd32f834e0d057ec4e41fdb958a6794397b73612e16303a98358d292eed

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