Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ca2755097ce466…

MALICIOUS

PDF

76.1 KB Created: 2021-03-29 08:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6825e00826c9e4608cc0e26f8c7a6f39 SHA-1: 30a251ad2320c82ccf429dbd79a6b0dbe2792d32 SHA-256: e8ca2755097ce4664d8b34231680db346f92c81b25f39a695b6f0ac2f56b47ec
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical PDF_SEO_LINK_FARM detection indicating a mass external link farm. The ML classifier also assigned a high probability of maliciousness. The file contains numerous embedded URLs pointing to external resources, suggesting it is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection strongly suggest a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/aws?utm_term=dead+sea+scrolls+vs+bible PDF link annotation
    • https://dinabowufijub.weebly.com/uploads/1/3/4/7/134751612/6195719.pdfIn PDF document text
    • https://fegovelusilefu.weebly.com/uploads/1/3/5/3/135330230/robitagukoxijinuzi.pdfIn PDF document text
    • https://luvabuzizav.weebly.com/uploads/1/3/5/2/135294148/xivemufoxi-demaba-kakigo-kaviwaxoze.pdfIn PDF document text
    • https://nikudedixipapun.weebly.com/uploads/1/3/4/6/134692686/fotukofatogeb-pijuj-gipexoginafe.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/51675109680.pdfIn PDF document text
    • http://jesibijifinuz.mywebcommunity.org/96380075099.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/4205043.pdfIn PDF document text
    • http://dreabling.online/comic_template_photoshopewbo8.pdfIn PDF document text
    • http://myirn.icu/what_is_the_weight_limit_for_lightweight_boxingumvgz.pdfIn PDF document text
    • https://senemoribut.weebly.com/uploads/1/3/4/7/134703027/1206986.pdfIn PDF document text
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/wiles_manewuniwole.pdfIn PDF document text
    • https://wurumoziwozosib.weebly.com/uploads/1/3/4/6/134644160/5250564.pdfIn PDF document text
    • https://wagigezo.weebly.com/uploads/1/3/0/7/130775958/2502041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_a64afa93834e4204b19cdfc6b39b6d19.pdf?index=trueIn PDF document text
    • http://fopatumupun.epizy.com/baofeng_bf_888s_user_manual.pdfIn PDF document text
    • http://forezepolutaju.onlinewebshop.net/tipos_de_funciones_lineales_cuadraticas_etc.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/volume_of_prisms_and_pyramids.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_28da81ca574f4ae2ae1a017eddaa6add.pdf?index=trueIn PDF document text
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_183e79724a024ab980ee7b06eafd2094.pdf?index=trueIn PDF document text
    • http://suvumudupese.epizy.com/gewako.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_0125ccc033e04cf9ad33cf314cb96eb7.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_0dba0dc32e3f48cdb21fed49ba3b7c57.pdf?index=trueIn 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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 5132 bytes
SHA-256: 05313b6ebb0cd987c4eec8c57e71ded8a3edcb6a679af02d2164b8ce92e5a873
font_01_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 10888 bytes
SHA-256: 21d246ad055c20438573ae608eb9d2e01c92678e4623e56d8b2d0892f2113731