Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f7bb08f9a46c73…

MALICIOUS

PDF

43.6 KB Created: 2020-11-09 14:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7ac1da71d17377658d03dcfe03889663 SHA-1: d7762f4a7ed470dcc4c1072527d5df808643ced7 SHA-256: 00f7bb08f9a46c7384b46164f4183a2ffd589ad82476cb4dfbc7c1d676f35d52
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://trafffe.ru/123?keyword=white+pages+sacramento+ca+area PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389603/normal_5f996d49a3f57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_5f9c28194e2c3.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/xuniziwonimidojosud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f874f55c9999.pdfIn PDF document text
    • https://sevivuninuk.weebly.com/uploads/1/3/4/4/134459749/845487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_5f9498839dea1.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/punobinabesujodazufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_5f95a1eba4197.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/lixavej_rivutavipulox_vunezikavad_lirumonoguwako.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/fuluperomuvo.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/3549d25e-6bbf-41b0-bbc1-500d23223386/feterizujaduxenu.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/dads_guide_to_wdw_crowd_calendar_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9efd5c3-d878-461b-8bb9-a51158ac99e2/5488505341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1564259f-3463-4a86-b29e-6078f7566bd3/pilajuboxemuwoditobamas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/933752ec-5db8-4b56-89ea-db7b83f6e0c2/jobevoxewopukupawivekuva.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/romupujov.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_off00006a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2F 5328 bytes
SHA-256: 4e58eb98a8440988e44060188dedd959a8117f1d66bdd63f99f87deeb194dfb3
font_01_sfnt_off00007c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C38 10880 bytes
SHA-256: 4f913558f4fb5af3b54d8dea035ce6686024c9cb5c11ba807a7c283c2aa3cd22

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