Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c268b3b0b1c8bbf…

MALICIOUS

PDF

47.0 KB Created: 2020-11-07 00:29:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 52c148ea306d75439f5eadcfb77470a1 SHA-1: 95decd6e1bc5ab604d551ac34e48a9347f07ce8d SHA-256: 2c268b3b0b1c8bbf245c4d5701f6dcd348c2771062c6140289e21c3d2b0f416b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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.
  • 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=balloon+td+6+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f8dad8fb44b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f93b1263e5b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8719c3a8dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5f935dc231169.pdfIn PDF document text
    • https://zirasave.weebly.com/uploads/1/3/4/0/134096010/revaseran_roliwuj_dijono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5fa17b2023d7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_5f961cddcccc7.pdfIn PDF document text
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/1634545.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/dbbb9fc1fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://lusiwelop.files.wordpress.com/2020/11/brunner_and_suddarth.pdfIn PDF document text
    • https://malopotobi.files.wordpress.com/2020/11/tofubejaginatiwavovijefuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e932ef5-585e-435d-9d1b-e6914453e77a/bazoxadaworupisonan.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/wuwiwesexusof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1B 4504 bytes
SHA-256: b38290025ed0a9041c36a2c6ea137cef15deb1afe49959baf4fdcf7ca576bf9d
font_01_sfnt_off00007a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A65 11276 bytes
SHA-256: d3b3050de6e5add378815ab23ce27d92d6fdb5723dcfea813e20a0b5b794844c
font_02_sfnt_off0000a105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA105 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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