Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8a03f8613c8876…

MALICIOUS

PDF

70.5 KB Created: 2021-03-14 10:25:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 38f2953aac2075eef6653534d21cb351 SHA-1: 246dd662f79cb1bd928396c7a8a457ddd96d8430 SHA-256: 8a8a03f8613c887604927821ca4874dffb55606305f74541b8dda6fb5b4083b5
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=grammaire+essentielle+du+fran%25C3%25A7ais+niveau+b2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366659/normal_6042c1cd20efe.pdfIn PDF document text
    • https://faxosuxen.weebly.com/uploads/1/3/4/3/134342902/gisup.pdfIn PDF document text
    • http://tomobufefiz.iblogger.org/magoosh_gre_formula_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484635/normal_6035c482d5b56.pdfIn PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/b6aa47cec.pdfIn PDF document text
    • http://tefituguj.iblogger.org/32847681462.pdfIn PDF document text
    • http://tavajan.iblogger.org/core_java_interview_programs.pdfIn PDF document text
    • https://faxilazow.weebly.com/uploads/1/3/4/7/134725206/98a9a41ab1017.pdfIn PDF document text
    • http://kuxuvajivor.iblogger.org/avatar_last_airbender_game.pdfIn PDF document text
    • https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/nagebalito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476122/normal_5ff248362d6f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_603b44546afe9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489415/normal_5fee4ccee8825.pdfIn PDF document text
    • https://baliwiwun.weebly.com/uploads/1/3/1/3/131380001/8826606.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatasinunevuto.epizy.com/crawl_outta_love_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/87294175368.pdfIn PDF document text
    • http://rilinaga.epizy.com/20371147240.pdfIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_901dbdc574e34765953a22ffca9e35e5.pdf?index=trueIn PDF document text
    • http://mekigif.epizy.com/landing_page_website_template_themeforest.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_4e003a922c254881b8c3f48affad8801.pdf?index=trueIn PDF document text
    • http://korapidupekab.epizy.com/dunegorawanafesuxebugu.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_b0dc0f588c8549b39c0943b3b2d88b05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wurivuve/jemiroxaf.pdfIn PDF document text
    • http://meladuk.rf.gd/sijowapus.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_off0000d249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD249 5596 bytes
SHA-256: 29d84c8f99587207aa0df5a3ac4f74c012cabf6f7a9c2567d4b0582f74d5514d
font_01_sfnt_off0000e540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 11176 bytes
SHA-256: de4ac3b909a94096d5b50fc9bd5d46772a4eaa46afc7b3a4a4a29751471591c4