Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a184007d1ca2667…

MALICIOUS

PDF

83.4 KB Created: 2021-03-14 13:27:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 66c28402d9a99b344491626dc01ac735 SHA-1: 88afe46bc6019cc517d41285aaba87b479851db9 SHA-256: 7a184007d1ca266753b49bd8282e753fe032f4937f3f667c5cc112c6ad9aa634
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains references to 'Romeo Juliet study guide answers' and the authoring application 'wkhtmltopdf', indicating a lure to a potentially malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://botokaw.ru/wix?keyword=romeo+juliet+study+guide+answers PDF link annotation
    • http://cmb-accueil.com/xugilimerufawavuwang080o.pdfIn PDF document text
    • http://strgb2.ru/blues_guitar_institute_reddit5zngw.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/vudupogiludodozaba.pdfIn PDF document text
    • http://marafonsport.site/sears_slide_in_gas_range_whitel01km.pdfIn PDF document text
    • http://zikajewuz.22web.org/33166945613.pdfIn PDF document text
    • http://majikok.mygamesonline.org/bivod.pdfIn PDF document text
    • http://filanion.online/marlin_glenfield_model_60_disassembly3cvc4.pdfIn PDF document text
    • http://timecodes.net/kotavewasaburorexe618sk.pdfIn PDF document text
    • http://alex-chekalev.com/xosusejutojujeneduzivulizq7e9.pdfIn PDF document text
    • http://marketes.pro/vijugozadotebijawufi8xv69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tejoratu.epizy.com/basic_knowledge_of_computer_programming.pdfIn PDF document text
    • http://tawazowifow.rf.gd/8256081228.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_3c034cc8d3624140b15f303e922e8c2b.pdf?index=trueIn PDF document text
    • http://kakasis.onlinewebshop.net/music_an_appreciation_11th_edition.pdfIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_7f06bc18e0764cee8543d24b5e1c7478.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_f1bd060281894df5bcb67ebbf09f22cd.pdf?index=trueIn PDF document text
    • http://bilazuwabipuz.epizy.com/99695146906.pdfIn PDF document text
    • http://lasakarafivof.epizy.com/30547022733.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_5b609caf0d374935a45687b847743aac.pdf?index=trueIn PDF document text
    • http://nakarajibap.myartsonline.com/fairy_tail_en_franais_saison_7.pdfIn PDF document text
    • http://zijodere.rf.gd/bujexebuj.pdfIn PDF document text
    • http://perinuve.epizy.com/pawisetijotex.pdfIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_cc916eb038bb42ad941d2bca050ce82b.pdf?index=trueIn 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_off00010903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10903 5424 bytes
SHA-256: 6604d480acc0bfcdbe304555da37485f06faf9f002e0adf244bb795b4098fd86
font_01_sfnt_off00011b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B76 10664 bytes
SHA-256: 3edc658a7493c5d8b72b5353e32a0a0203ab56dc98f66534e66dc47a01d0547c

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