Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb9f27e2351328a…

MALICIOUS

PDF

46.5 KB Created: 2020-11-07 02:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3aec358a55018d662a5a29d9311f44c1 SHA-1: d151c4a240e185092fa7dc05db5d851ae9e27461 SHA-256: 4cb9f27e2351328a99fd6ee8a88fa096fdde58ed0e57d2c878be2b8713c03c5a
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://traffking.ru/123?keyword=unmountable+boot+volume+fix+windows+xp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5f9f2dac41659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f88a4479332f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_5f8d32313421a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_5f9d6aa423598.pdfIn PDF document text
    • https://bitebizato.weebly.com/uploads/1/3/4/5/134583528/6803089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f9820ed55935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f9c5feab3bc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_5fa24e79f2f4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdfIn PDF document text
    • https://woragolofumo.files.wordpress.com/2020/11/solve_and_graph_inequalities_worksheet.pdfIn PDF document text
    • https://zojemadej.files.wordpress.com/2020/11/73587489466.pdfIn PDF document text
    • https://sidelid.files.wordpress.com/2020/11/fiche_exercices_calcul_littral_5me.pdfIn PDF document text
    • https://werojadiv.files.wordpress.com/2020/11/10113983697.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/memefiwavajevabex.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.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_off000075c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C5 5440 bytes
SHA-256: 122da3cf1e2962cbd70687e86872dd9c36fea17ed84b547ebfdd1025077178e3
font_01_sfnt_off0000884f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x884F 10884 bytes
SHA-256: 63df858d4fcf049794c5c16ae1488d7571f095ddacd536c87d907025a5af346f

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