Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd0ece3fd2bf5dc…

MALICIOUS

PDF

76.6 KB Created: 2021-02-28 00:59:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3d9e6ec1ae4d02c30d10209020c967ad SHA-1: da37f89533c700ad7fb578d29b625b4ef69f7612 SHA-256: 1bd0ece3fd2bf5dc4cbb1bb5ea89016cacd368492b64d8613df4493d1202a6ae
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on disposable hosting, suggesting an attempt to obscure the final malicious destination.

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
  • 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://dugedepap.ru/wix?keyword=all+the+devils+are+here+louise+penny+pdf PDF link annotation
    • http://katipef.medianewsonline.com/ruvazo.pdfIn PDF document text
    • https://xudekumuf.weebly.com/uploads/1/3/2/6/132681038/labigitulopufedem.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/zoxag.pdfIn PDF document text
    • https://numevajuga.weebly.com/uploads/1/3/0/9/130969633/baseten.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/para_elisa_piano_notas_simples.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/jeu_de_carte_32_voyance.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/tutorial_autocad_2016_espaol.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/how_to_build_a_website_from_scratch_wordpress.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/hebrew_dictionary_and_thesaurus.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/rca_11_galileo_pro_tablet_review.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/dunejapusorefuk.pdfIn PDF document text
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/75f98a8b52817.pdfIn PDF document text
    • http://zitugaxusi.mygamesonline.org/rivabagaropom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389370/normal_5ffef88721f1b.pdfIn PDF document text
    • http://korogesubelokut.mypressonline.com/63605872717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitujiduruv.myartsonline.com/davojamoxorapajegoke.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/how_to_turn_volume_down_on_adt_panel.pdfIn PDF document text
    • http://sukokovevaz.atwebpages.com/kisulixejewe.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_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 5280 bytes
SHA-256: fddb021f40efefe0c99d1052b1c5ddce3e8ac690ba54641f6820674a951a9f0c
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 10300 bytes
SHA-256: 143d017e618cc5e50327de45d430e1d6716690a389b6bad2252337df87c61cbb

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