Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b06bd329bfbae62…

MALICIOUS

PDF

72.8 KB Created: 2021-03-29 10:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f2ab95bd7d0a4b41068c58309e2c305d SHA-1: 75853d11de6135758aa2b53523d9ca45cd8eb60d SHA-256: 9b06bd329bfbae622ae349e44a7548b519fa74bc7157410a5cd1d8f81befbba9
146 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that redirect to various domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of PRC/3D content and the ML classification point towards a sophisticated malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://druttle.ru/strik?utm_term=microsoft+visual+basic+2015+textbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448343/normal_5ff1e781e9f91.pdfIn PDF document text
    • http://logunesunoj.medianewsonline.com/applied_pathophysiology_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_5fd0b9e79c93c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_602b804df26a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_60109ebb188f2.pdfIn PDF document text
    • http://bisewilorilamej.sportsontheweb.net/writing_a_business_plan_for_dummies.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5ffea3ade8911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_601ca50b66211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5fe61d8919264.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/neumonia_por_aspiracion_en_perros.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404745/normal_5ff4ad080d640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulorowanutabu.atwebpages.com/7242131900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1594a5e-f5c0-4f6d-9dfa-73d204e79da0/voberopop.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_5b5e3ab1e1154e56a58f0c2724f68fe7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a42c6ae-1c00-4432-8bdc-7debd7644144/6926183541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60aa4d62-9cef-49e3-ab8b-80c181090db1/36450563711.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/75426588161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33095810-2d93-4c09-b3f1-6003d9ed94af/duridepafafave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10fb1b2b-8b6b-4db1-9ae7-428483be6ac6/53615126191.pdfIn PDF document text
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_00f96958856048bdb0effe12487df0ff.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_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 5936 bytes
SHA-256: 674ede607880207302214ed7c0165dda725d370cc531015b3c913ded1a434cbf
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 11688 bytes
SHA-256: f6cc908d2087a500d341ae192a7edddc97257892c5338c37f2f86bd50484868d

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