Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03af50d2157ee15…

MALICIOUS

PDF

76.9 KB Created: 2021-04-22 06:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1c8fb7fc6496597d53259a2a3383133e SHA-1: ba555155392e53c0d3fb8bf90b5ca2340cd74dff SHA-256: a03af50d2157ee155e9179f7c70d640c489830439bcc95a0af23f62416a653dd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=how+to+export+notes+from+goodnotes PDF link annotation
    • http://gonisavuxur.iblogger.org/duwivetotewa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447278/normal_5fc5fd2e462dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454825/normal_603a17cfd0c26.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/durga_saptashati_kannada.pdfIn PDF document text
    • http://vivudanu.scienceontheweb.net/kajokidapegefoxovem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_601a843db012e.pdfIn PDF document text
    • http://funokeronox.iblogger.org/wipuwanamozegotitapaga.pdfIn PDF document text
    • http://besemafobekilir.22web.org/control_total_de_calidad_lennart_sandholm.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/definition_of_first_language_acquisition.pdfIn PDF document text
    • http://jusojixanona.getenjoyment.net/job_description_of_a_personal_assistant.pdfIn PDF document text
    • http://zudepogumo.medianewsonline.com/24594281691.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/27347313086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501041/normal_6047c2770cea9.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/duvane.pdfIn PDF document text
    • http://kapibijirupe.iblogger.org/learn_korean_free_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tawuvoj.rf.gd/56011434902.pdfIn PDF document text
    • http://raseloxezonavo.epizy.com/74174873843.pdfIn PDF document text
    • http://riwuzapivegeb.rf.gd/giforodu.pdfIn PDF document text
    • http://dojopugoput.epizy.com/77923678263.pdfIn PDF document text
    • http://pojudezafal.rf.gd/cyber_security_courses_for_beginners_uk_free.pdfIn PDF document text
    • http://mafokesa.onlinewebshop.net/adverbs_of_frequency_exercises_with_answers.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_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 5240 bytes
SHA-256: 60138acf2535f30bfa747562fb565f75f50eaaa23485c1f6caa32a9776c3e261
font_01_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 11332 bytes
SHA-256: ac08fdd3c17a748a31d02c3fdb43ba218681ee549b3674cc65e011934325b77e

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