Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3465531377fb18…

MALICIOUS

PDF

71.1 KB Created: 2021-03-06 09:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ce112934636cb00eeba7e8405c3a7cff SHA-1: 4726cd530b54595245660c4d3a239bebae25c3e1 SHA-256: cc3465531377fb18ce4ef83594020bee9947e25a8170c72356b2dae78a7cd93d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=how+to+reset+my+brother+printer+toner PDF link annotation
    • https://cdn.sqhk.co/lekibefefu/foXghFA/90685640257.pdfIn PDF document text
    • https://zoditivifu.weebly.com/uploads/1/3/4/3/134316547/sogibuge_tuzedam.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/vijeUhc/spiralizer_recipes.pdfIn PDF document text
    • http://alkim.xyz/705352604649w87h.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/idWRhij/free_online_personal_swot_analysis_test.pdfIn PDF document text
    • http://1xbets-regs.site/numaretafivixavpiw9q.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/dhb8wgd/piwukiruguweg.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/xupigedetekoje-pugepefojiburas-morujumuguvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500425/normal_604172932912d.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/fXhjgdg/bbq_grills_costco_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/netesatova/jbHlZii/poxiwek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_6010ad58a837b.pdfIn PDF document text
    • http://udilische.club/jagulafobulofajrfm60.pdfIn PDF document text
    • https://divevuke.weebly.com/uploads/1/3/3/9/133999966/jojetaxeboxaw.pdfIn PDF document text
    • https://cdn.sqhk.co/kuretunaba/igIjjO9/suzipupilefidokasemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_601a49a41798e.pdfIn PDF document text
    • http://tricitysikhs.com/xojoronopejoruxezared9815.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5ff6837a1a709.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_f906ff79b6e649cba137517a890f68d7.pdf?index=trueIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_5d8d63798ffc48ec80366226d0fcfb67.pdf?index=trueIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_639c6cbbbe344a56bdc07d286579b1b6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 4900 bytes
SHA-256: 4f7fdc0bf9b0897624919f882b748bd8a39dfdb465b9ff6d829d5750410abd3f
font_01_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 10004 bytes
SHA-256: 58fb7cfe946e7e8323bf9497f5050d8e8ec598b97d90fd1011eed8f8fbf6db58
font_02_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2