Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3b68df7ac6e436…

MALICIOUS

PDF

96.2 KB Created: 2021-03-09 11:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8983feea8eca820c1fc9b004df49a4fe SHA-1: 8d8e781acbae2a349b7fc242d018584821cb7b85 SHA-256: 8f3b68df7ac6e4361860ef87d3f250c2e6bb018a35c3220c06885d7be740e33d
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0' strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the ML classifier further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=are+michigan+covid+cases+increasing PDF link annotation
    • https://nukarefu.weebly.com/uploads/1/3/4/1/134131348/kusovegofikanolo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499635/normal_5fedc05130c83.pdfIn PDF document text
    • http://dixajadabaw.66ghz.com/17033214386.pdfIn PDF document text
    • http://003-center.ru/digitech_gsp_21_legendrleai.pdfIn PDF document text
    • http://mesretly.xyz/sagobofakukugojonitubbu18k.pdfIn PDF document text
    • http://dvertsoff.ru/wavaguwetogimixujezugo6zzeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444092/normal_5fdea292b4295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_60411f3247321.pdfIn PDF document text
    • http://menetufebev.22web.org/box_top_collection_sheets_thanksgiving.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_6046b2ae3a306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_601a9d05c7064.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/kaxepibos.pdfIn PDF document text
    • https://xazefobilizap.weebly.com/uploads/1/3/1/3/131384081/tasaxe-zerir-kojodug.pdfIn PDF document text
    • http://lbaranaydin.com/jumekorebigelakididqjtm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_603ccdc6be6ed.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/challenging_cognitive_distortions_worksheetsypv41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_600fd293b8d55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://werewej.epizy.com/54698163746.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_e7bbc2a4e670457ba04665f890477071.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_f10fbe598ed8425da9576360366049a0.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_eb1f049d0ad14e50a6fb05d2684aded3.pdf?index=trueIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_836a159e49d94015ad624c4e72f60bc7.pdf?index=trueIn 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_off000139da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DA 5368 bytes
SHA-256: f65ece7cba59cfb87952bb1e0454113287f92321d5e3127e543cacabdb3b9124
font_01_sfnt_off00014bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF9 11524 bytes
SHA-256: 4c23665c3ca708216dc51e3c1ac1348fbf54811f7cfffa1101f7f477767f44f0

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