Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f5310437c27aec…

MALICIOUS

PDF

74.6 KB Created: 2021-05-18 03:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3954f1a179230949c8764ed612ac4325 SHA-1: 839091dd7401df2f2825f75db1b68e171465fc89 SHA-256: e8f5310437c27aec699f9b9bbf5c3ea52b7eca7d5197f709821d91b7380f7394
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=rare+fortnite+accounts+email+and+password PDF link annotation
    • https://kukibutojiw.weebly.com/uploads/1/3/0/7/130775835/xaxutofosij.pdfIn PDF document text
    • https://popetebebulexu.weebly.com/uploads/1/3/4/3/134316921/telominin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474750/normal_6010a974de171.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/xugokit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424982/normal_604cba0bc2e52.pdfIn PDF document text
    • https://vebupanulaxufe.weebly.com/uploads/1/3/4/3/134393715/8230615.pdfIn PDF document text
    • https://zisowuwaxafo.weebly.com/uploads/1/3/4/7/134700917/8931f2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_60002662130d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445889/normal_602c9e5659d4a.pdfIn PDF document text
    • https://vabudefun.weebly.com/uploads/1/3/0/7/130775589/6d6c213f728.pdfIn PDF document text
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/bopepusonalewe.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/557346.pdfIn PDF document text
    • https://juvetobewuneted.weebly.com/uploads/1/3/3/9/133997509/205edcd4c656e0.pdfIn PDF document text
    • https://bilujujopubeda.weebly.com/uploads/1/3/4/6/134661541/wuwodul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_600e5f0a61707.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/folexapurilowe/google_docs_convert_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/average_reporter_salary_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/easy_keto_recipe_book_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/does_fruit_cake_contain_gluten.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/74220104815.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/bioscope_live_tv_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/nuvaravug.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/tanuxap.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_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 5400 bytes
SHA-256: 754a1abd5e765354ac2d9bc89e2ffa33d28b1adfc9b6c85facead70a57a93d69
font_01_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 10624 bytes
SHA-256: bfca563ad2fd56edc4730dddb7e117d4ed8be2b05e95598389bd36506d556a2d

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