Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d3e65a4419cbba…

MALICIOUS

PDF

77.1 KB Created: 2021-03-14 22:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7b5d6ad3785b4c6ffb0e7c543199f085 SHA-1: 286d0a4787466ab846787c5b1e37cf3d19a17ae7 SHA-256: d3d3e65a4419cbbaf69c7b3e347281ea2399182c3fc2265d9ce6df27a41dbd9e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=how+to+start+a+debate+club PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495860/normal_6033bf71c96ba.pdfIn PDF document text
    • http://penageli.getenjoyment.net/2553770038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461250/normal_5ff15c791a36e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5fc880f9bc49c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5fd19a595eaa3.pdfIn PDF document text
    • http://loruvas.iblogger.org/11847763627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_601ce87f5c3bd.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/tesla_model_3_standard_range_plus_performance_upgrade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484399/normal_6037ff76bf873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_60391a8da5165.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/74254451234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_60275c5b5589f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokosen.atwebpages.com/what_is_d_in_statistics_class_10.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_2d364364e30e4fac92e5166998a76e25.pdf?index=trueIn PDF document text
    • http://wiwosotu.myartsonline.com/cocina_criolla_argentina.pdfIn PDF document text
    • http://laniferes.epizy.com/37710473982.pdfIn PDF document text
    • http://robabaxagolelez.rf.gd/performance_assessment_significado_en_espaol.pdfIn PDF document text
    • https://64f3f273-fd79-4cea-bc15-92b2431614e2.filesusr.com/ugd/542254_ac26cc3af687472f8c712caf93328a5f.pdf?index=trueIn PDF document text
    • http://roposinifewex.rf.gd/91872025432.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_65d4ce1c2f184a0eb8d07e4232fcab6d.pdf?index=trueIn PDF document text
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_f3ab9b117ae5454f8b0cdab897c3cff8.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_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 5128 bytes
SHA-256: ff480cdf1849d3fee4b8387a1c8943488f596a1cefbcd7f3dddbdd40b466f039
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 10944 bytes
SHA-256: e0e2a73f136ef59a76c91f270457fbbd02992466b18dd57ecf287d6783b699d8

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