Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e1bb8d15979b4e…

MALICIOUS

PDF

101.4 KB Created: 2021-05-31 21:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 746245abad7fa752d43ac598a597629d SHA-1: 64ae78ec514f775fdeaea4d05b482574a8499817 SHA-256: 90e1bb8d15979b4e6cba41af371bcd996cea193053d699c564ad12ded6c42c1f
156 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 of which are to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to redirect users to external sites for malicious purposes.

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://dugedepap.ru/wb?keyword=proyecto%20de%20lectura%20para%20segundo%20grado%20de%20primaria%20con%20preguntas%20pdf
    • https://cdn-cms.f-static.net/uploads/4479705/normal_602ca774d8378.pdf
    • https://lufotoloxa.weebly.com/uploads/1/3/4/3/134318907/3244558.pdf
    • https://venubitolaxi.weebly.com/uploads/1/3/4/3/134372432/70a3093aa3c2.pdf
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/bevajamejema.pdf
    • https://jutemutugitut.weebly.com/uploads/1/3/4/6/134617260/jipuwimorupuja.pdf
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/8867303.pdf
    • https://static.s123-cdn-static.com/uploads/4408992/normal_5fc7a4d31c92a.pdf
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/janipes.pdf
    • https://static.s123-cdn-static.com/uploads/4497359/normal_5ffbac8bd8592.pdf
    • https://cdn-cms.f-static.net/uploads/4471488/normal_602b8f1783074.pdf
    • https://kivogumit.weebly.com/uploads/1/3/1/0/131070776/mofog-ronelekogelek-gugikumemab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nilanom.pbworks.com/f/zisoxubujezi.pdf
    • http://zepupifob.pbworks.com/f/sepuretaxikuwogo.pdf
    • http://lugozamuxika.pbworks.com/w/file/fetch/144415551/40317457060.pdf
    • http://visetululiv.pbworks.com/w/file/fetch/144415359/4963700852.pdf
    • http://nagomax.pbworks.com/w/file/fetch/144412650/9113624359.pdf
    • http://sepaxebi.pbworks.com/f/812184178.pdf
    • http://niwomif.pbworks.com/f/what_is_kundalini_awakening_process.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_off000149b2.bin
977c07c75ae9674297b0c00c407133936066dcccb07ae4181b89c7e1aea6eceb
pdf-font-stream PDF embedded font (sfnt) at offset 0x149B2 5576 bytes
font_01_sfnt_off00015c9f.bin
20fac6e5cea0b02f6691b41881cf5e0095a4635a34b39b61099ced15680cb15f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9F 12352 bytes