Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e235fc9ddb4801f…

MALICIOUS

PDF

81.7 KB Created: 2021-04-30 13:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 551973efce431b6f43ab6e72410af600 SHA-1: de560ce2f0434bf2c19bb0acf03fdc2568c014b8 SHA-256: 3e235fc9ddb4801fe5e51ca439086b26fb8c19d18dc1b45ad042a1adc99a953f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9996

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://jumiwimov.ru/strik?utm_term=reading+comprehension+kindergarten+worksheets PDF link annotation
    • http://skidki-day.site/best_autocad_reader_for_machh4sb.pdfIn PDF document text
    • http://silver35.ru/malixaduxidicbmjc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475847/normal_606de76aee324.pdfIn PDF document text
    • http://rijexofugovu.medianewsonline.com/accounting_and_finance_an_introduction_9th_edition.pdfIn PDF document text
    • http://bestunew.xyz/munaledunm8jyd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_6066653c30b24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_6033938934561.pdfIn PDF document text
    • http://ita-talia.fun/coolpix_p510_user_manualjgdf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_606b96d289b3a.pdfIn PDF document text
    • http://helpverifedbadges.com/97798260929s4efw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403537/normal_5ffb8aa6f2eeb.pdfIn PDF document text
    • http://20970907.net/probability_worksheet_2_answer_keyfyc5w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://susabumo.atwebpages.com/interview_questions_and_answers_for_customer_service_representative.pdfIn PDF document text
    • http://powagamojij.onlinewebshop.net/gowefikaruv.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_9fcab396a0a542049fb2ea021c92fcd7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/40133894765.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_d8e248f573504106b7a64973a3af9abe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/58197569932.pdfIn PDF document text
    • http://lopakesuzuw.atwebpages.com/mipelu.pdfIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_5a734424d517497db051b1da2a03c146.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/zikarikujudewogolu.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/rutegexi.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_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 5616 bytes
SHA-256: 77d5bda42819549ffcf26cfee515c5eae4159f736c299fc8a15ffe19736a2fd1
font_01_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 10740 bytes
SHA-256: 6ac19bd93a8bf7a7c2e584765e9beb417157545ea30883e29c7e32708a4df7a6

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