Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f5e52434e7ed14…

MALICIOUS

PDF

69.4 KB Created: 2021-05-26 14:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a991ff51fc3dc2fb0a016cb486e097a1 SHA-1: a2d9e0fef22f9fe0c95b2f6b8850bc0b5e9f7f43 SHA-256: 41f5e52434e7ed14a9fb3e4231d4c0af8dab11c79a2a9ff45ef9f8bf342e2d18
124 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URIs indicates an attempt to redirect the user to potentially malicious or deceptive content, possibly as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8212

Heuristics 4

  • 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
  • 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://druttle.ru/strik?utm_term=schedule+c+instructions+codes PDF link annotation
    • https://vikilegopufuber.weebly.com/uploads/1/3/4/5/134588451/zewadupidu.pdfIn PDF document text
    • https://sibemawiwojaro.weebly.com/uploads/1/3/4/8/134887292/c40e32a.pdfIn PDF document text
    • https://jabexigiji.weebly.com/uploads/1/3/2/6/132695602/934972.pdfIn PDF document text
    • https://nilijinaxobizag.weebly.com/uploads/1/3/4/3/134356504/nidopurel.pdfIn PDF document text
    • https://biluvumilu.weebly.com/uploads/1/3/1/8/131860938/8fc1fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446158/normal_60076e02aabd7.pdfIn PDF document text
    • https://mepopukivar.weebly.com/uploads/1/3/6/0/136083549/552bdc060e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_5fe89cbcf1043.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/tafajoje-ralixagilebifu-mowiwufodov-fidakobe.pdfIn PDF document text
    • https://ledegukumimajem.weebly.com/uploads/1/3/5/3/135393042/1236432.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/3067594.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/9e05601c-f621-4414-9796-9758fa4352f0/envoute_moi_integrale_ekladata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b89abafd-1174-47a1-9064-5f8185b33eb6/51855114557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29bd3800-67d3-47af-9152-ad1d6c8ab54f/tik_tok_dance_songs_playlist_2020_clean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ea4573-6730-4cb6-b739-dd2833505f7a/90497286676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e4b0230-411f-4a55-88ae-174b5614c379/97085754718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b865211-a12b-41c2-acaa-181f8ee3925d/how_to_study_organic_chemistry_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e743693-278e-41ce-8f46-54f76283cc0f/ejercicios_notacion_cientifica_3_eso_fisica_y_quimica.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 4920 bytes
SHA-256: 3ec1f989725aa23c4d6b78acbbf4802b5e3a36ffc4e55b2c67ab425baf7b4d82

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