Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c97088e937e0fe0…

MALICIOUS

PDF

70.5 KB Created: 2021-05-27 09:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cca6a0230efa74abc6fd32504a7a3e77 SHA-1: 22850aaa034723ade3cb863cd3b022f02e45c190 SHA-256: 5c97088e937e0fe09dc2d984ee911dca53a720b2a2d643b7026d3fe35070d680
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious sites. The primary URL, 'https://dugedepap.ru/strik?utm_term=can+i+submit+passport+renewal+online', indicates a phishing lure related to passport renewal. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or scam purposes.

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://dugedepap.ru/strik?utm_term=can+i+submit+passport+renewal+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464301/normal_605a590a9e5ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421336/normal_5fee35d019ca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_6016c284e918a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482020/normal_60613986bfa5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_6052102382b07.pdfIn PDF document text
    • https://kiwuvewe.weebly.com/uploads/1/3/7/5/137509443/tilulazumesupigenase.pdfIn PDF document text
    • https://jolifovinezaxa.weebly.com/uploads/1/3/7/5/137518016/d0f590904c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_60159358d8f62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_604630d686dd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372696/normal_5fc5ad6509dc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_5fd61a962c7e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_6026a2b6da53f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_606dde7e62ace.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fe6012a9ba1c.pdfIn PDF document text
    • https://zunaxufozasu.weebly.com/uploads/1/3/4/5/134500871/mivofijolepasim-zikuvamazigi-deluf.pdfIn PDF document text
    • https://dopovebo.weebly.com/uploads/1/3/4/4/134431975/3567d43ed72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413361/normal_5fecd47a50a6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5fd10fa1091b7.pdfIn PDF document text
    • https://wekopigigosem.weebly.com/uploads/1/3/4/5/134503853/3cba41197d.pdfIn PDF document text
    • https://damasixo.weebly.com/uploads/1/3/5/3/135322107/1855190.pdfIn PDF document text
    • https://giwunoxesej.weebly.com/uploads/1/3/1/4/131408529/motudesave.pdfIn PDF document text
    • https://duxobibalarig.weebly.com/uploads/1/3/4/3/134360367/merutoxem.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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 5100 bytes
SHA-256: 4085bfb202c39b6ebdbf1aa371f868d0c5c32e9ac7c1a254995184947848c81f
font_01_sfnt_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 10532 bytes
SHA-256: a763d8450e71f4959c89089d1293cff67bbb4a912819e4339f31791fbfacbef5