Malicious PDF — malware analysis report

Static analysis result for SHA-256 70646d091004a5c4…

MALICIOUS

PDF

42.0 KB Created: 2020-11-09 09:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 27afb6aba242b19552f6989ac19e88df SHA-1: 7c551e325c039c3abce46abb17f06d329fc6dd74 SHA-256: 70646d091004a5c49175221cf2dac3f595cf45f720f878add55bbfb1ce57b480
66 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 1.0000

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=what+is+form+it-201+or+it-203 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380080/normal_5f9c2f319205e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_5fa208460ffbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f8737d80afe6.pdfIn PDF document text
    • https://goneludolazoga.weebly.com/uploads/1/3/4/4/134488647/aca2c0a8fc4f4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_5f8ed48e8740c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f9907808b993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5f9cf65662f9b.pdfIn PDF document text
    • https://fulojozizarotuv.weebly.com/uploads/1/3/4/3/134318677/6963383.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rofananuso.files.wordpress.com/2020/11/aprender_portugues_livro.pdfIn PDF document text
    • https://zumitid.files.wordpress.com/2020/11/78557331217.pdfIn PDF document text
    • https://jutikofudu.files.wordpress.com/2020/11/galowenu.pdfIn PDF document text
    • https://kinoxef.files.wordpress.com/2020/11/uma_cancion_para_novalie_google.pdfIn PDF document text
    • https://kefawikilub.files.wordpress.com/2020/11/bexusudofi.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_off00006291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6291 5508 bytes
SHA-256: eb3d49a2f2b9938fca1a9e6303e5a2bdd3c5b8423c024725a3cec38710eb638a
font_01_sfnt_off0000753c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x753C 10640 bytes
SHA-256: a966ede967e1137f436a7bef639a3b57bd2f868cf5d0f46061ddaf76719e284d

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