Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b09981a4ef4d19…

MALICIOUS

PDF

77.2 KB Created: 2021-04-11 23:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aac98bbcf22c8377d40c0661b25bacd4 SHA-1: 180cd168211b3c104f4cfd172c475620116e0923 SHA-256: 55b09981a4ef4d19f17f222c3eb005f10c5fe01bf7ad9e8b91a0efcba94b36bc
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 0.9991

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://resalured.ru/strik?utm_term=who+carries+shop+vac+brand PDF link annotation
    • http://xuxikurov.mygamesonline.org/arthritis_back_exercises.pdfIn PDF document text
    • https://jatazuleb.weebly.com/uploads/1/3/4/6/134662889/49d168c49793.pdfIn PDF document text
    • https://zabagazepag.weebly.com/uploads/1/3/4/4/134498959/b56094baa89d99.pdfIn PDF document text
    • https://loxufoxoxow.weebly.com/uploads/1/3/5/9/135982175/ff827a07a87.pdfIn PDF document text
    • http://luxisulejoxo.getenjoyment.net/estructura_de_los_canales_de_distribucion.pdfIn PDF document text
    • https://zikepasut.weebly.com/uploads/1/3/4/1/134108801/9430755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421768/normal_5fc925d24fe6e.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/dezobonasixuwali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453889/normal_6041fe573a63f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464055/normal_602f0ed9baa44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421042/normal_603b0a059539b.pdfIn PDF document text
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/puvanenufer.pdfIn PDF document text
    • https://kirimobo.weebly.com/uploads/1/3/1/0/131069812/welojefofabepevube.pdfIn PDF document text
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/7180f1.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/download_campus_toeic.pdfIn PDF document text
    • https://masezinonorokun.weebly.com/uploads/1/3/4/6/134685416/1470488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495385/normal_6037cef9d8ce9.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/wemupajese/chairperson_s_report_sectional_title.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/me_browser_mini_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/samsung_gt_p3113ts_case.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/45740934701.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/mijabuzane.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/zuvulawedivewinita.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/aristotle_nicomachean_ethics_book_2_chapter_1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 5340 bytes
SHA-256: f5dcb30335a67f97967170bed154b70e2e101dee00a09141549819fb77f7d17f
font_01_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 10836 bytes
SHA-256: 99c77acbe8e3d4072219d15d16c1f90c9ed3d04429405e074034e75e0612f604

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