Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d03db7adb08210…

MALICIOUS

PDF

78.1 KB Created: 2021-04-28 17:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2cdf04d0c6be864f3df17a93bf832c7d SHA-1: ed3c5d60047f1b5626c17eb8e2fa2c3f4e68c91f SHA-256: d8d03db7adb08210ccdec2af32cad1023ae9ff9bea52813baaae266d14401a05
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded JavaScript and a critical heuristic firing for a link farm, indicating malicious intent. The primary external URI points to 'kuzutuzo.ru', suggesting a phishing or malware distribution attempt. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kuzutuzo.ru/strik?utm_term=trail+tech+vapor+drz400 PDF link annotation
    • https://rafexalubez.weebly.com/uploads/1/3/4/3/134311016/dovedobizuduteja.pdfIn PDF document text
    • http://retamos.mygamesonline.org/pdf_alternator_manual.pdfIn PDF document text
    • http://zokazurimila.mygamesonline.org/jipilajimirufed.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/49292810437.pdfIn PDF document text
    • http://lixebafevoku.mypressonline.com/learn_english_grammar_from_beginning.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/how_to_crochet_a_granny_square_left_handed.pdfIn PDF document text
    • https://vusesuke.weebly.com/uploads/1/3/4/7/134723580/d141a2818dc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c813987-7a80-41bc-b1d4-69760837fba0/japugozatizin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b00617-b8bc-40fd-bfeb-c6531466795e/jopozumigudasar.pdfIn PDF document text
    • http://xologikaju.atwebpages.com/rebejolovawe.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/risk_assessment_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/android_auto_not_working_f150.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/18079860259.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/alteraciones_geneticas.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_50f3b58f6c7b431c88959d17625472c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63241c69-4361-40ed-8046-b8977ffcdc2a/whirlpool_self_cleaning_oven_accubake_system_manual.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_da27007d227749d691b5395997f3257b.pdf?index=trueIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/rosie_revere_engineer_summary.pdfIn PDF document text
    • http://peledopa.myartsonline.com/senior_accountant_resume_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8f82fe-2cc0-4dce-b86c-fd401e2ed2e9/ikea_usa_catalogue_2018_english.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/fivaviruk.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_2b8e19e571594a8c9dee0d29633fc45d.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_f7e75853685441b4b9352e4d5e96b1bb.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_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 5272 bytes
SHA-256: 6a003d87e94724921c309c754bd847c7027eee0097d812dfe1d2247d9b881f15
font_01_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 13488 bytes
SHA-256: ba3bd409073e6301f3c3aba5c358ec400bedabbb62bac710cafe865bcdcc6645

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