Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5359dedf62d581…

MALICIOUS

PDF

78.3 KB Created: 2021-04-06 07:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 38f5f31dfb771e7c6b4a175e0d3fb1fa SHA-1: 5cfd66318e7cebdba2cb5878996804de0ec20b2e SHA-256: ef5359dedf62d5814bf6dc4a0e78e98cad6ac755760d6ab326933b7dbe6cbe4e
156 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 0.9996

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 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.
  • 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/award?keyword=boot+hill+ballots+and+bullets+pdf PDF link annotation
    • https://cdn.sqhk.co/dowepigakaw/Dgh3AS0/getewipurid.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/6RicjfD/wixibonolosazuwekokusub.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/9U9iehi/modern_air_combat_environment.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5fecb5e7e03f0.pdfIn PDF document text
    • https://cdn.sqhk.co/parepejapoki/ehjjesJ/crusader_of_centy_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460476/normal_600cb5c817e24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_601b426548428.pdfIn PDF document text
    • https://cdn.sqhk.co/kipasewimoni/LWav8jh/3770423578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_606a5f4037617.pdfIn PDF document text
    • https://cdn.sqhk.co/geruvijiwiw/Jjgoger/chicago_manual_of_style_cover_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanubili/bumpy_ride_song_in_320_kbps.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/tuberosuv.pdfIn PDF document text
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_dc27e88957284e098f36ce8ccda5bd79.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_e7f57eaed21148c48e485a8ba3bcce66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusagi/falekukavot.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/git_github_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/berijozafitol.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/28294530547.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/3d_animation_software_for_android.pdfIn PDF document text
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_4993115e786d4b75836a16af06e03abf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/jekadana.pdfIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_e7457c7af15444cba4d5046baa7935b7.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_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 5224 bytes
SHA-256: 01333dc10a64b7909f94ef6e22a00ac3587fb0fba596c02116bdb9be9b892c5a
font_01_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 11440 bytes
SHA-256: 2f9ce6bc13cee836fe1072946a8b5058cb19103b5ca2322186a3be96aa9aba74

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