Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eee60577ef4afb8…

MALICIOUS

PDF

33.4 KB Created: 2020-11-05 23:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 27ddc9240616cd27ec9695be49ce7f8c SHA-1: b8902fbfdd12dafd88b47f1a4a5f8d2ea508664c SHA-256: 0eee60577ef4afb8fd80597151502559991aca0049f76dde07f07a8b0d2bbf4d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links to external PDF files, identified by the PDF_SEO_LINK_FARM heuristic. One of the primary links, https://traffine.ru/strik?keyword=words+start+with+phe, suggests a potential SEO manipulation or traffic redirection scheme. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and embedded links point towards a malicious intent to direct users to potentially harmful content.

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://traffine.ru/strik?keyword=words+start+with+phe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418778/normal_5f97385479435.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/guxutiledup-susaredi.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/xobuzivux-ruraditixax-bolefalonibumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_5fa0ff340e396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_5f9be3ce91657.pdfIn PDF document text
    • https://bovuvodesibos.weebly.com/uploads/1/3/4/3/134377535/xisuduginuzuwun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_5f8a1c4372445.pdfIn PDF document text
    • https://bitoxusimafitaj.weebly.com/uploads/1/3/4/3/134311342/jidenomadubiserupu.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/nimuwet/36719990726.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/dios_mio_ayudame_oracion.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/the_spiderwick_chronicles_book_1_the_field_guide.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_off00004455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4455 5120 bytes
SHA-256: 9f02c893d6e82c9f8e8e5d432abb15dab89edf5bac27c83ccd395da2af374e64
font_01_sfnt_off000055d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55D1 10328 bytes
SHA-256: 94a510859af5759673d82e9e3a65cb143e903b015c95642073a92bf599af6d14