Malicious PDF — malware analysis report

Static analysis result for SHA-256 b198cc633cb7b098…

MALICIOUS

PDF

79.0 KB Created: 2021-03-31 06:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faffcff407a0304eb386dee7a96dbac3 SHA-1: 7136c16555c1798773ed6859e8600ee9843a49fb SHA-256: b198cc633cb7b0984b5c938fcbe13a4fa4d4f7cfd5f9be6f90e232471971391a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, and one primary URL that appears to be a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=the+remains+of+the+day+movie+script+pdf
    • https://pepevifive.weebly.com/uploads/1/3/4/4/134480859/ludukalawifanezexaz.pdf
    • http://gedozudusinap.mygamesonline.org/business_benefits_of_cloud_computing.pdf
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5fdaeb1fa2d11.pdf
    • http://somukegizos.66ghz.com/8005225385.pdf
    • https://cdn-cms.f-static.net/uploads/4475376/normal_6049c89b11def.pdf
    • http://pirunumilusarib.sportsontheweb.net/xulejidorilawegefa.pdf
    • https://zolotamazuragif.weebly.com/uploads/1/3/2/7/132712333/wokedemutapaz-sesudakenu.pdf
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fd05b7feb33c.pdf
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/488ecd0f4e1524a.pdf
    • http://ganoget.scienceontheweb.net/cfit_ui.pdf
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fcf93a96a59a.pdf
    • https://retelajipubo.weebly.com/uploads/1/3/4/7/134700068/9a76583.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_4db2715bcff34ef3ba1befdf106066d6.pdf?index=true
    • https://20e8ec16-a7ca-487e-906f-4b2d5c2744e2.filesusr.com/ugd/ab81b8_297a190d20d24bca90cfb5efa31f4bb4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/127289e1-a178-4d28-a149-bbdd0a313a45/kotowizopufasapamunujuv.pdf
    • http://nufiwimuzobo.onlinewebshop.net/44140245856.pdf
    • https://uploads.strikinglycdn.com/files/ada10c66-9437-4751-841f-ff249896e270/naxopidevesizosusaj.pdf
    • https://uploads.strikinglycdn.com/files/a4f0bc3d-ac72-4f73-a505-907d74b871fc/26796210595.pdf
    • http://dejuluv.epizy.com/pufosej.pdf
    • https://uploads.strikinglycdn.com/files/8a43838d-ed27-4bb5-96f6-c93c49613a03/81604746443.pdf
    • http://wutodabegaf.epizy.com/comparison_of_adjectives_esl_library_worksheets.pdf
    • https://2ed9768e-82a7-41f7-bc91-4b86d8d7aa0f.filesusr.com/ugd/bdbd91_f32f5146769b4779b0144e58e1a96663.pdf?index=true
    • http://gezixus.myartsonline.com/cbse_class_12_sample_paper_2020_download.pdf
    • http://xazitew.epizy.com/nixixowifugar.pdf
    • https://uploads.strikinglycdn.com/files/4ff8bf9b-bd10-4b3d-9d20-032d07cb395c/que_tipos_de_sistemas_operativos_de_red_hay.pdf
    • http://foweroboxufafuv.epizy.com/rheumatic_fever_antibiotic_prophylaxis_guidelines.pdf
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_09ea52e21d544448b21f6d1af0a31f36.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_off0000f58d.bin
701906e4476de30272380d675e105a23f77703a6129c0d3c951852b184df29c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 5472 bytes
font_01_sfnt_off00010809.bin
f2d34139ee6e5285b80cb4101342accc7e9a0143ca799a848261f96342d2cb9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 11248 bytes