Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4eac9d260e4b8b…

MALICIOUS

PDF

44.4 KB Created: 2020-11-09 00:26:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 703d79e9c823cc4c9d6bdcc926cf7f97 SHA-1: 9160b2b573a8163850c89d302ba9ca36720cc651 SHA-256: 6e4eac9d260e4b8bdd62fa9b67fe23b5dca74fdd30f5cae9b041a7ca0fd46105
96 Risk Score

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 1.0000

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://traffset.ru/123?keyword=118+elements+periodic+table PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://noxikadaguva.files.wordpress.com/2020/11/mabatorovetojulijuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/nememisofusevesinewujudi.pdfIn PDF document text
    • https://bobelikowufo.files.wordpress.com/2020/11/30911756732.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/tigo_common_stock.pdfIn PDF document text
    • https://fomisawix.files.wordpress.com/2020/11/ruido_en_el_pecho_al_respirar.pdfIn PDF document text
    • https://diwalelofi.files.wordpress.com/2020/11/66069261758.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/kinowuniv.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/53416325946.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/advanced_english_vocabulary_with_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/raxobop.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.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_off00006e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E15 5512 bytes
SHA-256: 374a7df288bd601d17c767a346cc664cfa5bc6abcd141b70e11011991b6f84de
font_01_sfnt_off000080b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80B1 11108 bytes
SHA-256: d2eeed18c3b4a8cc154ab0f14d10153b0c2cc6b3c692bb580aad33596cc88ebb

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