Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a36bd75d78c1c4…

MALICIOUS

PDF

78.9 KB Created: 2021-04-21 13:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9b9f1b5abdfa2ff872d0a7b0eb1113a0 SHA-1: ddbbcc82d98d4c17276cc695b7389d83c7a77418 SHA-256: a4a36bd75d78c1c4e532367e1ac09cd1c82d12ebc97210ce6f61ea044ceffef3
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic specifically flags it as a link farm designed for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for credential harvesting or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/strik?utm_term=is+comptia+a%252B+easy PDF link annotation
    • http://davorivugexawu.sportsontheweb.net/loxutafopizof.pdfIn PDF document text
    • http://kutejovanog.getenjoyment.net/japanese_gastric_cancer_treatment_guidelines_2020.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/40730928448.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/92675482694.pdfIn PDF document text
    • http://paradusafe.iblogger.org/32065655220.pdfIn PDF document text
    • http://lenulari.mypressonline.com/26642661610.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/44483739704.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/gestion_del_sistema_de_calidad_total.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/athlean_x_max_size_reddit.pdfIn PDF document text
    • http://zozamowewideno.mypressonline.com/computer_architecture_and_organization.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/how_to_ace_the_brainteaser_interview.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/zegozu.pdfIn PDF document text
    • http://dakekunagefasak.sportsontheweb.net/butchart_gardens_map.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/28645203308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://losuwanawore.epizy.com/online_7z_extractor_and.pdfIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/support_vector_machine_classification.pdfIn PDF document text
    • http://jebujuv.rf.gd/likitikezuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/82654258338.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/amc_contest_dates_2020.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/lucius_apuleius.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/73353334409.pdfIn PDF document text
    • http://nedelovuz.rf.gd/6139132246.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFB 4672 bytes
SHA-256: 02a2e50dcdb025d2c7a3942e7b3294cb298a720f0fd6ef64550f20860b72ed0d
font_01_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 11000 bytes
SHA-256: 8dab896092758496ea50d936b7d630d510ffac8e97f128703a9bebc07fd5a417
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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