Malicious PDF — malware analysis report

Static analysis result for SHA-256 088dc5072ef18cf8…

MALICIOUS

PDF

81.5 KB Created: 2021-05-17 16:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d3643bcc03adba2cefcbeb999d48cc8f SHA-1: bfab0f86d36f5de23de1edb67bc5ec2c9fa0b926 SHA-256: 088dc5072ef18cf860de74b89cee661e15d6299a2f083e4afeb3de0f666dd87c
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 hosted on disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection 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 content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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 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://lozipotod.ru/strik?utm_term=delta+riley+mini+crib+assembly+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369671/normal_6028acb1d0dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_6069fb3a3d2da.pdfIn PDF document text
    • https://zosixilerav.weebly.com/uploads/1/3/1/8/131856356/wusitewupi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_5fc714e30efe1.pdfIn PDF document text
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/5739887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_5fd9118075931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_603f7b9c8b184.pdfIn PDF document text
    • https://naxaludegefow.weebly.com/uploads/1/3/4/7/134776308/tofisafoxuvedu-lolovajo-pomasepar-tunamekejene.pdfIn PDF document text
    • http://vakexuk.22web.org/glacial_acetic_acid_sds_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_600c8cdec0c9a.pdfIn PDF document text
    • http://bejuzoz.iblogger.org/niveles_de_prevencion_de_las_enfermedades_periodontales.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485322/normal_5fe18f3d7dc03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_5fe80e8131a2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373504/normal_6002421739202.pdfIn PDF document text
    • https://tusaluzope.weebly.com/uploads/1/3/4/3/134374665/90adbb117957.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417652/normal_5fe599ee016dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_60248314e68b2.pdfIn PDF document text
    • https://gepolurur.weebly.com/uploads/1/3/4/6/134610134/liduxopetasuwi-xogopufufufu-rasavorovewak-buzenasuzivutub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_606aa5b2831a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_606a63e9621a0.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/raguwikebebam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_92b16d9178344699a3382a633e64647c.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_f62a5b516b5945ac8a5c22e885b77b2c.pdf?index=trueIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_93aee42fd8b844edac7ca2cbceb91c0c.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_8016f59456b14e949b5a71be1a6d0c8e.pdf?index=trueIn PDF document text
    • http://tapebujetunagu.rf.gd/fapugadipor.pdfIn 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_off0000febc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 5188 bytes
SHA-256: e6b6153041baca14b20b60ae7236070175d34dcd2b5b90c75f223b5c197c3e29
font_01_sfnt_off00011055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 11020 bytes
SHA-256: 3b749076b7ce21db8aec9e702481c3a03d2fa0439b3b40a3b9b0578841a1bc26