Malicious PDF — malware analysis report

Static analysis result for SHA-256 07fc841ae75ecfc0…

MALICIOUS

PDF

77.0 KB Created: 2021-03-25 08:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e742eee04155d2ca8fe54463981e40b SHA-1: 7ec1f89df32cf6c264254383b0b67f02385a9e0f SHA-256: 07fc841ae75ecfc031fb707997c72e042cc8b0198951a9b20ece33ca7f6e7ba8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=lost+inside+of+you+piano+sheet+music
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/wulixav.pdf
    • https://cdn.sqhk.co/pimibopugugo/o7ijqjf/90073471599.pdf
    • https://webuxeneme.weebly.com/uploads/1/3/4/3/134368634/4e1589b.pdf
    • https://visuriteja.weebly.com/uploads/1/3/5/3/135323353/682e8af.pdf
    • https://cdn.sqhk.co/gowamojon/jjAifDs/christian_cinema_free_movie_code.pdf
    • https://cdn.sqhk.co/rufadexu/dsjtgf6/amazon_gutschein_fur_kindle_bucher_einlosen.pdf
    • https://newadagunezadev.weebly.com/uploads/1/3/4/6/134684801/jinumoladu.pdf
    • https://marotebage.weebly.com/uploads/1/3/4/7/134712984/9572988.pdf
    • https://cdn-cms.f-static.net/uploads/4383918/normal_604db72ccd58d.pdf
    • https://cdn-cms.f-static.net/uploads/4368493/normal_6050712ae9b0a.pdf
    • https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/tobovupobu.pdf
    • https://cdn-cms.f-static.net/uploads/4476601/normal_604b8d807d8a5.pdf
    • https://kilavolofijon.weebly.com/uploads/1/3/1/1/131164174/4043282.pdf
    • https://davobudo.weebly.com/uploads/1/3/4/4/134432622/pavokomati.pdf
    • https://wexivupesowapab.weebly.com/uploads/1/3/2/7/132712225/tewoji-nalolox.pdf
    • https://cdn-cms.f-static.net/uploads/4446170/normal_6049a72ce42c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8a05da06-75fd-4b4b-8779-f7668a2fa4a0.filesusr.com/ugd/da32d9_1846571e333d499abf36099922468db0.pdf?index=true
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_1e94a79748874427a9c8c37cdb12d07a.pdf?index=true
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_90d754014d5247f4b624c1a66f5a4f40.pdf?index=true
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_e5993fc22c7844c4b20971b0d58bc4f6.pdf?index=true
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_2d07d32e0c104cb4a40affc4bce7abcf.pdf?index=true
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_d217f386e78d467e967e678091aa6e47.pdf?index=true
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_ad7b6ed678d04457a5064482608db916.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd9.bin
d15457ef850beff5071bc03db220fe41f7da50899b73846992b67e59b1f6defa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 5308 bytes
font_01_sfnt_off000101d9.bin
06a1e36b5e24826026952acdab48a8f47a79b2431f659aa6a6c41d11b18c1a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 10704 bytes

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