Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cff0594859e626…

MALICIOUS

PDF

89.7 KB Created: 2021-03-23 11:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eab54fea0ef929b04f2eea255d90fae7 SHA-1: cc1a156008765e7f9a2dcacad3849af393746a2c SHA-256: e5cff0594859e6265c042ca5cfb7fdd4c18fd88091e1914613ad2286f48fb7ae
96 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 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 4

  • 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/wix?keyword=probability+rules+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367305/normal_6050f5593e19c.pdfIn PDF document text
    • https://kuximakid.weebly.com/uploads/1/3/0/7/130739256/7417331.pdfIn PDF document text
    • https://vidapuromojesa.weebly.com/uploads/1/3/4/8/134890941/nenodo.pdfIn PDF document text
    • https://zuwexonoporij.weebly.com/uploads/1/3/5/3/135317719/musek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365628/normal_5fc5960ab0888.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530036/normal_5ff5f9e2399f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450045/normal_60325b1372a10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fomaralunex/core_java_interview_questions_book.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/20285040241.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/how_to_burn_wheel.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/opening_blend_s_bon_appetit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187e7c90-dae6-4804-b34a-609e45f093b3/black_and_decker_20v_circular_saw_blade.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_5a30bbddbda440cc84ba4d5416421ea7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/956a31a5-d0c6-4473-a102-07d1380ce8e0/1999_yamaha_timberwolf_250_reviews.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_166835c7a7b5497298a8ee6e6d2119fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29050411-a63f-4f93-857c-82f36a24b3b6/68710559161.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/sidimuguvebodas.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 5304 bytes
SHA-256: 49ba38da14988fa9e6e4f834b0004160ff898bf9c6354bb324cac68ea34c746d
font_01_sfnt_off0001101a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101A 11244 bytes
SHA-256: 07ae23849dfe03323714df6dbb3f92e1a21ace9cf36bf2705467901065761d7f
font_02_sfnt_off00013645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
font_03_sfnt_off00014b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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