Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a376f63e05fe24…

MALICIOUS

PDF

75.5 KB Created: 2021-04-17 21:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1e662f33ebc7bd05df1e68485601bd8 SHA-1: d6dd80d1b3577a6c801a8a7d136857b6b6560a4a SHA-256: 95a376f63e05fe2485642c7e7a50374037a9d613a823c05205f22b3cc6e1cb19
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=are+citizen+watches+worth+it
    • https://cdn-cms.f-static.net/uploads/4485572/normal_601a5722e051e.pdf
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/8280704.pdf
    • https://gemiletux.weebly.com/uploads/1/3/2/6/132681217/noxogodezezaxuso.pdf
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5ff8707b9e46c.pdf
    • https://cdn-cms.f-static.net/uploads/4365582/normal_602f10d550d07.pdf
    • https://wuxorazaw.weebly.com/uploads/1/3/2/7/132712222/jelib.pdf
    • https://cdn-cms.f-static.net/uploads/4403959/normal_5fd3c992b70b7.pdf
    • https://rubebukani.weebly.com/uploads/1/3/0/7/130740450/e954a84acfe1.pdf
    • https://varozuwibudod.weebly.com/uploads/1/3/4/3/134327914/vilijatezogirogegoz.pdf
    • https://cdn-cms.f-static.net/uploads/4484143/normal_605006e3ab1fd.pdf
    • https://cdn-cms.f-static.net/uploads/4367311/normal_602e237d56500.pdf
    • https://rinedasufuketon.weebly.com/uploads/1/3/4/3/134340565/ramakij.pdf
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/jiwobizasapininavigu.pdf
    • https://cdn-cms.f-static.net/uploads/4445745/normal_600ff09ce29a9.pdf
    • https://cdn-cms.f-static.net/uploads/4467573/normal_603211ba299bb.pdf
    • https://static.s123-cdn-static.com/uploads/4470681/normal_5fffea426c63b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dfabac9c-3a78-4d86-b112-ccf1750024e9.filesusr.com/ugd/b46e2f_b1003b1feecf4b8e914c13de862aa78f.pdf?index=true
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_c9e6043367854a249af670959d50bac2.pdf?index=true
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_285ef8be5b9e4ab5be91967c863e4139.pdf?index=true
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_864bec48d45049dbb6ef356420c583ca.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_off0000e93c.bin
63ca1015b753c9c8c215328fa7f7d05f113e124542680ca4801f01803beca405		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 4984 bytes
font_01_sfnt_off0000fa47.bin
45e4326a1b534b02d9b336d1e2038f372e441f0e2c03ca0cef82511450f8e6ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 11312 bytes

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