Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b95c235b1c9b55…

MALICIOUS

PDF

97.5 KB Created: 2021-03-15 14:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3a055f1229f8922a7977fc25795ed3ff SHA-1: ef312a8fab97d3764f67d7279d054e9493eaab11 SHA-256: 20b95c235b1c9b55f6f0eb5953175935729415cf6b06c0a50d62471056829f50
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a site related to 'football manager 2015 wonderkids shortlist', suggesting a lure for users interested in that topic. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=football+manager+2015+wonderkids+shortlist PDF link annotation
    • http://mofawab.66ghz.com/1987_polaris_trail_boss_250_parts_diagram.pdfIn PDF document text
    • https://baxufolodamiz.weebly.com/uploads/1/3/1/4/131408032/1510927.pdfIn PDF document text
    • http://bupomorefa.22web.org/80659671205.pdfIn PDF document text
    • http://bulepozobagepud.mygamesonline.org/11385380397.pdfIn PDF document text
    • https://jutebipofan.weebly.com/uploads/1/3/4/3/134334370/dosenebagadej_revitaxatogek_pobuvunubazivu_sasumudivif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bac4d03-bac7-4d0c-bab3-3a4069722eb5/59692533948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a811e2-7f25-419a-a56e-9238f0cc84c0/the_natural_book_ending.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_fdffa003b8904b19a7b7e8614329282c.pdf?index=trueIn PDF document text
    • http://tanonarimunal.myartsonline.com/41393826065.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/22544650156.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_9fcd53aa1df54f7fbf961ad157a86862.pdf?index=trueIn PDF document text
    • http://zexizel.epizy.com/how_fast_can_i_lose_5_pounds_of_fat.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/ejercicios_de_matematicas_1_grado_secundaria.pdfIn PDF document text
    • http://rezutarewefiwup.epizy.com/algebra_1_completing_the_square_worksheet.pdfIn PDF document text
    • http://demevobofimozu.epizy.com/approximation_ibps_po.pdfIn PDF document text
    • http://dibulazovila.rf.gd/bindable_property_xamarin_forms.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_off00013961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13961 5940 bytes
SHA-256: 2f4627b180342fd0633d023b7f6f4366f13be695b8406a441934505ed6f6ccc8
font_01_sfnt_off00014d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8A 15012 bytes
SHA-256: 1400da7b91f4ebc1ebeae8346913b14ca87e4fad941387ea9c64a2151d85edd1

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