Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa630a489e70ef7…

MALICIOUS

PDF

78.1 KB Created: 2021-05-20 11:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ea72a9915dfb952af371a744bf7d9ee0 SHA-1: 57446fac468c9eb2994b3df7e841855ec0b2fcbe SHA-256: baa630a489e70ef7cf56b72742bfe335205fecdef18664441471eea30a4fed99
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or direct users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or SEO scam attack pattern.

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://kuzutuzo.ru/strik?utm_term=brainpop+civil+war PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471948/normal_603d90e88fe16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_6021013758f64.pdfIn PDF document text
    • https://jatufabafalili.weebly.com/uploads/1/3/1/6/131637938/lemikogubonurej.pdfIn PDF document text
    • https://judumufef.weebly.com/uploads/1/3/0/7/130738812/bofuwuve_vumebigarubimuw.pdfIn PDF document text
    • https://sujarusokebukok.weebly.com/uploads/1/3/1/4/131437349/xezesemez.pdfIn PDF document text
    • https://sunudufexune.weebly.com/uploads/1/3/0/8/130874439/juzawuzer.pdfIn PDF document text
    • https://dodanopo.weebly.com/uploads/1/3/1/4/131408738/8865807.pdfIn PDF document text
    • https://pabifiliponisod.weebly.com/uploads/1/3/4/3/134367040/mijubawatufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_60354cde0a435.pdfIn PDF document text
    • https://numuwawi.weebly.com/uploads/1/3/2/3/132303164/soxajagu.pdfIn PDF document text
    • https://vexigijetizi.weebly.com/uploads/1/3/4/7/134771524/4647977.pdfIn PDF document text
    • https://kewegiru.weebly.com/uploads/1/3/1/4/131438086/belapakibanazom_zepufurozimaf_pomug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460678/normal_6037829d712a8.pdfIn PDF document text
    • https://nasakavagupudo.weebly.com/uploads/1/3/4/7/134766537/9801846.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/titojederu.pdfIn PDF document text
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/8433180.pdfIn PDF document text
    • https://wefexubi.weebly.com/uploads/1/3/2/7/132712326/toputefosidosovinuna.pdfIn PDF document text
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/699f72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e768e6c2-e23d-44cf-aac7-1826eefa63a1/91245444133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614f0f3b-fbb7-4694-9d93-16edde31a188/zesasolaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a5546f3-9194-4fd4-b3c5-d102eb937ea9/zukoxewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9151b356-3b38-4107-ab5d-9143f86fd27b/fixakopudigefozinopo.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_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 4948 bytes
SHA-256: 734e5f93315c1eb5caec9dcc2411233a23f36dc0527a14e5358718fc87e4aec5
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 11704 bytes
SHA-256: 332341afb4091ea5fac62cd5afea08ddde6529d304eaabc9e92640b646b22838