Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57b9a5b8275c0cb…

MALICIOUS

PDF

83.2 KB Created: 2021-04-11 18:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9329d89a4bee5e7d589ff2967bde0d87 SHA-1: d4680f492738676ff397d62610c0480cbaff37c6 SHA-256: c57b9a5b8275c0cbf136ff5fc9fff41856307ee02e14b16e6f74209f2620420f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs are likely used to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malicious redirection campaign.

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://resalured.ru/strik?utm_term=oracle+pl+sql+interview+questions+for+3+years+experience+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370269/normal_6000e6edacb53.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/mizelokamibofezexezodiv.pdfIn PDF document text
    • http://zutelotojenexop.getenjoyment.net/resumen_del_libro_un_mundo_feliz_de_aldous_huxley.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/what_is_taco_bells_new_5_box.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/8045739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_606e0c07c97f9.pdfIn PDF document text
    • https://mefewenitili.weebly.com/uploads/1/3/1/3/131379946/totelujubobutusak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_604ae9351c30c.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/4946642.pdfIn PDF document text
    • https://lusovajilabijix.weebly.com/uploads/1/3/5/3/135351537/vidutumovegunan.pdfIn PDF document text
    • http://valigulepi.scienceontheweb.net/how_to_connect_brookstone_wireless_speakers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_606489d512f4d.pdfIn PDF document text
    • https://jefolujolu.weebly.com/uploads/1/3/6/0/136096950/e04ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_60211120717eb.pdfIn PDF document text
    • https://papuwupiruji.weebly.com/uploads/1/3/4/3/134348025/2369993.pdfIn PDF document text
    • https://xikunozazoteta.weebly.com/uploads/1/3/1/4/131453294/gasiwa-xumitawubukedu.pdfIn PDF document text
    • https://semototip.weebly.com/uploads/1/3/5/3/135386148/putexiviweji.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/photoshop_for_beginners_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454677/normal_5fef0a8aa40e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416798/normal_5ff7583c047a0.pdfIn PDF document text
    • https://vopobibipudo.weebly.com/uploads/1/3/4/6/134620476/3284968.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 5788 bytes
SHA-256: ee8ce2c8c3e96ce3ea3978acbfb83ea2aaef2a03fb4cfbbf56718c7f2bd9af84
font_01_sfnt_off0001193f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 11160 bytes
SHA-256: 68fbcd6b843ed91ac7b53948154059e0ce98ef95117e0137e37e4661f6b8e71c