Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af80b9d07a41084…

MALICIOUS

PDF

76.2 KB Created: 2021-05-07 17:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ae4a1358972379b97ddf493624578883 SHA-1: ebd553d754fe895fb4e155d9cf6ba442fd25a6c5 SHA-256: 4af80b9d07a410847ac2386010eb23bc284814934625994cfe3318ed623bbae8
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 0.9998

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://midufefew.ru/strik?utm_term=best+quran+with+english+translation+book PDF link annotation
    • https://lixawedubofalat.weebly.com/uploads/1/3/1/4/131407760/bodoxozovave.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/1917866.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/what_is_the_most_reliable_washer_and_dryer_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446782/normal_604041129b98a.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/jadojuwuwedukasuwusu.pdfIn PDF document text
    • https://fenorepaxok.weebly.com/uploads/1/3/1/8/131856491/566409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450160/normal_5feefa4e1ef70.pdfIn PDF document text
    • https://resafuki.weebly.com/uploads/1/3/1/3/131398359/1647383.pdfIn PDF document text
    • https://nusepetuvake.weebly.com/uploads/1/3/3/9/133997573/sumolefasudix.pdfIn PDF document text
    • https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/7150530.pdfIn PDF document text
    • https://ninusava.weebly.com/uploads/1/3/1/4/131436980/2687705.pdfIn PDF document text
    • https://fezuwujazu.weebly.com/uploads/1/3/5/3/135347069/waralesuwibexeki.pdfIn PDF document text
    • https://tepewumulu.weebly.com/uploads/1/3/1/3/131384412/rexurefurixoninu.pdfIn PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/xuzorosikifiwuz.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/kebufele.pdfIn PDF document text
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/2095897.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/neporezofov/formulas_de_cuerpos_geometricos_area_y_volumen.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/20111929163.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_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 5420 bytes
SHA-256: b20be4637dcc98ffd380837999db5a94dea0508f907be5c7b315cc95464eb276
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 10664 bytes
SHA-256: 87c0bc02bdd37a3d5cf0265dff07f57dd963d57e47108beae15256be9e3da4e7

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