Malicious PDF — malware analysis report

Static analysis result for SHA-256 2412a5383e7ea24c…

MALICIOUS

PDF

77.8 KB Created: 2021-03-28 22:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ffe5bca5b737e8b8925a243bb6f179b3 SHA-1: 2af5f919b495a4e10ef8986721c064264484c8a1 SHA-256: 2412a5383e7ea24c508a3560b1fb162d72e8984928326550de2e87c5fb0fcb2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the sheer volume of outbound links suggests a malicious intent, possibly to distribute further malware or engage in SEO spam. The primary attack pattern observed is the creation of a link farm.

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://xezojetit.ru/strik?utm_term=rikki+tikki+tavi+summary+wikipedia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489237/normal_5ff42483bb06b.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/vesepobomonuj.pdfIn PDF document text
    • http://javosewo.sportsontheweb.net/jovigurujutanowonokiki.pdfIn PDF document text
    • https://borikalubir.weebly.com/uploads/1/3/2/6/132681749/eca41.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/kofezoxuse1o2e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470542/normal_605cb85eb2a13.pdfIn PDF document text
    • https://gawotajar.weebly.com/uploads/1/3/4/5/134525297/2d53400df10b87c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_5fe9f5cae619d.pdfIn PDF document text
    • https://vizefibamoraxob.weebly.com/uploads/1/3/4/6/134613498/340175.pdfIn PDF document text
    • http://businessmentality.com/17000497864xy97k.pdfIn PDF document text
    • http://vamolufu.getenjoyment.net/microsoft_advanced_excel_formulas_tutorial.pdfIn PDF document text
    • http://rudovatimokasum.medianewsonline.com/fotovolovo.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/tezofuretejom/berlin_bahn_map.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/wendler_531_accessory_exercises.pdfIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_32a07ddc85e443469eedb4257b5b2617.pdf?index=trueIn PDF document text
    • http://xutenujute.myartsonline.com/bepizibena.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/75087685024.pdfIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_b617570bdec343d0b12b355904901ec6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawovojo/83534893633.pdfIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_4391b191737d4bc0a8cccffa5f2ab0ba.pdf?index=trueIn 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_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 5400 bytes
SHA-256: 0afbe712bc0d6f3c9f1413a5261e7f99c0b0ff86b4b74db6243dd6252bfb1190
font_01_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 12264 bytes
SHA-256: f9991b65036d1567b2437edc7e076dcc6b164996ebc99f111eecc5875477426b

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