Malicious PDF — malware analysis report

Static analysis result for SHA-256 021635ecf35cd78f…

MALICIOUS

PDF

75.5 KB Created: 2021-04-05 19:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0755c20adb5058a56bb43f0678d0888e SHA-1: 21aa9352f84eb1ee037aca56274af73212b7fc28 SHA-256: 021635ecf35cd78fa5bcf83facb018e0befb0cdecb191df886799528c87147c9
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/strik?utm_term=sony+xplod+1000w+speakers+price PDF link annotation
    • http://tunulawofu.iblogger.org/71089514809.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/ea783cfed1e.pdfIn PDF document text
    • http://igoscandinavia.com/how_many_times_can_you_take_the_arrt_examtaqi1.pdfIn PDF document text
    • http://jutidewolojura.mypressonline.com/21313947491.pdfIn PDF document text
    • http://akvatehnika74.ru/bewinizewe4rmzh.pdfIn PDF document text
    • http://negozio50sconto.info/convertir_gramos_a_ml_con_densidadnt4u9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446500/normal_6050ebeca0517.pdfIn PDF document text
    • http://accueilcmb.com/competency_based_questions_for_team_leader26y9z.pdfIn PDF document text
    • https://tugovupovo.weebly.com/uploads/1/3/1/3/131380456/tenojugava_benurovunide.pdfIn PDF document text
    • https://vuxidozeni.weebly.com/uploads/1/3/4/6/134669409/9851820.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_6006b93050835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369330/normal_5fdeaca0a025b.pdfIn PDF document text
    • https://tunivarururi.weebly.com/uploads/1/3/4/0/134041149/cadfc.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/lorozobokom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bimitev.epizy.com/wivipikenujixiwewunupu.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_4f3f49ef83604b7184db7a650792b8ee.pdf?index=trueIn PDF document text
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_f54ddabf1f7b4e7b9a50fa116dade345.pdf?index=trueIn PDF document text
    • http://geforagegi.atwebpages.com/4th_grade_math_sol_review_packet.pdfIn PDF document text
    • http://bajewilogofiro.epizy.com/mcgraw_hill_social_studies_textbook.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_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 5688 bytes
SHA-256: 5adf7001fc36192c5be98975f695f92bf816b7c92e4b05cd6e456f7edcb489e1
font_01_sfnt_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 11860 bytes
SHA-256: c94796ece4fcda91a72d09c854b534b9929dc464a841f3720d7fe9aa62dcfadb