Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f238b0a1ea8d9d7…

MALICIOUS

PDF

76.9 KB Created: 2021-03-22 02:24:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 96618bb954ea6b14a2ef4cbdd02f8857 SHA-1: efae9e5cfdad2ef5e38d86d85c79c4a2e6bc3d9a SHA-256: 6f238b0a1ea8d9d72703b6d854273d8c04059a1439ec75f44fdc3ec64322a8ea
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/wix?keyword=forest+hills+academy+lake+city+florida PDF link annotation
    • https://nigukaxo.weebly.com/uploads/1/3/1/4/131453065/6a343cf82b9cbe9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5ff0c7ec043eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411228/normal_5fdba38e38d41.pdfIn PDF document text
    • https://sugovodeko.weebly.com/uploads/1/3/2/6/132681033/993075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_602e81f94dd21.pdfIn PDF document text
    • https://gewujamagig.weebly.com/uploads/1/3/5/3/135339218/tixazuxuwulin.pdfIn PDF document text
    • https://bumufufumobumag.weebly.com/uploads/1/3/2/8/132815806/8293440.pdfIn PDF document text
    • https://pozuxopukemo.weebly.com/uploads/1/3/4/7/134705319/94f6a59c3357.pdfIn PDF document text
    • https://rogenogenitel.weebly.com/uploads/1/3/4/3/134316557/wijesuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_603037dbb49c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452846/normal_603ff96aaeb84.pdfIn PDF document text
    • http://wivevemeb.scienceontheweb.net/99033467828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_6057e27e59ce4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5fc6f0f500835.pdfIn PDF document text
    • https://xijeruwenuvu.weebly.com/uploads/1/3/4/0/134018409/deebdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kegigija.atwebpages.com/mebavapupikunudefuvoru.pdfIn PDF document text
    • https://9fd063f5-a6e2-47f0-a1c8-15c646e36cc9.filesusr.com/ugd/ee11ea_0bdee4d43e7b40418ae59028811561e8.pdf?index=trueIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_181243400638407faa309786c1b9628e.pdf?index=trueIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_abdd339d64bd42688504557371c77de3.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_a467669e87734babae15c3c395721654.pdf?index=trueIn PDF document text
    • https://d787a32c-196b-4e99-9c98-3ae3c28023f9.filesusr.com/ugd/05b469_a8e95fbd12de40f2b799f3d186bbf2aa.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_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 5380 bytes
SHA-256: 9690347d2e7e679d55d08e0b2a500fae7266620ccb4168ed80086e9e586ac83e
font_01_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 10680 bytes
SHA-256: 5ec081374c3eefc5366f9cf4f121abdf5a4600bc12ad41b4f7c84be97ebe9a4a

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