Malicious PDF — malware analysis report

Static analysis result for SHA-256 99509240ebf8e6c0…

MALICIOUS

PDF

32.2 KB Created: 2020-11-08 06:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a79eae5d431842b69e246c8e9e9514f9 SHA-1: 255dad4bbbb5392e86a973d7c844e6243bd9c022 SHA-256: 99509240ebf8e6c0a281b0942edb848f68b5818fe42f843ce7f4fc5602879b9a
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://trafftec.ru/123?keyword=words+with+neap PDF link annotation
    • https://vajuwapokovis.weebly.com/uploads/1/3/4/3/134361820/9459879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5f98129c67b94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382958/normal_5f8c5611733cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388293/normal_5f8edb2ba1a06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f997c9083ee1.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/1542d996-79c4-48ba-9ab7-3514367925dc/tovitijiboxazagazetularo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d8f7f2-4b49-46ae-8d80-1f29e6431911/83176538369.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/merozasopegujibe.pdfIn PDF document text
    • https://bebezabezite.files.wordpress.com/2020/11/guxeresuniwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f1041e-0d49-415d-89a4-55fdbe4cc1e8/kofidunofugibaxet.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_off0000410e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x410E 5120 bytes
SHA-256: b01f716a0b482258c591448b13e7452f7c934d97efdbd6c99af59f83c4ad85b4
font_01_sfnt_off0000528a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x528A 10248 bytes
SHA-256: d9804fee0db80ed0bc860cdcde367bfeacee264bc3753f9c0f66e8ebd8b45ef9