Malicious PDF — malware analysis report

Static analysis result for SHA-256 581eff3ebbce47cb…

MALICIOUS

PDF

33.8 KB Created: 2020-11-06 16:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 50c573ffaae09d7828ea9b602e8039f1 SHA-1: 962bd337d36a9164d5b9cba83f07bf9cbeabafc2 SHA-256: 581eff3ebbce47cbd540108c805461aa5063e896bff0c946b20a1368877bebad
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://traffnew.ru/aws?keyword=i+m+not+a+robot+episode+25 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466996/normal_5fa4110536152.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/955be360-8a3b-4b59-936f-5c8e55ef8f23/49507306911.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/zuvezita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/269cd206-faf2-4c1e-baf1-6aa1895f07e7/20852883028.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/fasciola_hepatica_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/33377481807.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/2019_kia_niro_hybrid_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/2562085747.pdfIn PDF document text
    • https://gorujugiximu.files.wordpress.com/2020/11/karipevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e18945-6862-42ab-bb78-e84d5f2a8921/iso_dibujo_tecnico.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/3362036532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60af4d18-9610-4d5f-815a-0561b3db4503/al_otro_lado_de_la_linea_pelicula_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75edb66f-675b-4711-8602-f1f1592278e3/semiconductor_devices_physics_and_technology_3rd_edition.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_off0000482b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x482B 5404 bytes
SHA-256: c30f359a9e4bd08bfe185f40e48a23f9f0d15b2d7d066fe68e8bc30a76f8c2b4
font_01_sfnt_off00005a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6A 9524 bytes
SHA-256: 5f321076f11ff06046f4a723821c7ee12a1140507e233a38b7db48345e79d1f7