Malicious PDF — malware analysis report

Static analysis result for SHA-256 c238542086425b07…

MALICIOUS

PDF

75.5 KB Created: 2021-05-18 01:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84ea72911b30f164f58379d74876ad8c SHA-1: 1a3c41e6721f182d33de46b828a6fd893209fa52 SHA-256: c238542086425b07fdc74e82743d3a60adadcbd6dcfb5e9b530629022ce978f6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other free hosting services, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=nes+mini+drivers+windows+7
    • https://lubigovoxudi.weebly.com/uploads/1/3/4/1/134109264/nazogukajafalov.pdf
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/vodakejilu.pdf
    • http://doxugivo.22web.org/65358534656.pdf
    • https://mijezuri.weebly.com/uploads/1/3/0/9/130969422/jubigikida_wijozubevevoxo_pekubelu.pdf
    • https://ravawesasusede.weebly.com/uploads/1/3/4/5/134517270/5dd51.pdf
    • https://cdn-cms.f-static.net/uploads/4413238/normal_60585be855dd0.pdf
    • https://cdn-cms.f-static.net/uploads/4450426/normal_603a015ac2485.pdf
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/79c8bd9.pdf
    • https://cdn-cms.f-static.net/uploads/4416495/normal_604f56d55caa1.pdf
    • https://cdn-cms.f-static.net/uploads/4413243/normal_601923a783705.pdf
    • https://static.s123-cdn-static.com/uploads/4371244/normal_5ffccc76d9ca3.pdf
    • https://cdn-cms.f-static.net/uploads/4420034/normal_6058938d14bf1.pdf
    • https://cdn-cms.f-static.net/uploads/4386330/normal_602c3e208e66d.pdf
    • https://sewogasi.weebly.com/uploads/1/3/1/1/131163712/4531877.pdf
    • https://wimunalowuzew.weebly.com/uploads/1/3/4/3/134360992/50ba1a0462e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://motefif.rf.gd/56638154044.pdf
    • http://sobumewupuvuve.epizy.com/infographics_templates_for_ppt.pdf
    • http://midotujeg.rf.gd/keto_zone_diet_recipes.pdf
    • http://tomabev.rf.gd/52303135746.pdf
    • http://negavutagogo.epizy.com/43769362352.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1c.bin
6c529259c5acdf031a77d7c39e6b6076626f35883db0fa78cb2f52520b143a53
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 4928 bytes
font_01_sfnt_off0000fae8.bin
737b744a73b37b6ac0e9c4413c2b2089ed0cfc90b371bb5fcc6d81eb7b1c6197
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 10640 bytes