Malicious PDF — malware analysis report

Static analysis result for SHA-256 b906590c762b823a…

MALICIOUS

PDF

73.4 KB Created: 2021-02-23 08:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9cd945fb036c24b8722e4598a8d4497 SHA-1: 9ea57e29d05994544ba2b6c5eb3b508c13999e2d SHA-256: b906590c762b823a1234bf7a3a3a923d931d856ee7ec248c834f052b834e9bb0
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-hosted PDFs, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content hosted externally.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=streaming+film+the+chronicles+of+narnia+the+silver+chair
    • https://degugelusejife.weebly.com/uploads/1/3/2/6/132695568/vizimumodapemek_lepowiwuvoripok.pdf
    • https://dulowufokupi.weebly.com/uploads/1/3/4/4/134495444/ginixavuxinolum-logukagiwo-sofopitalut-gibuz.pdf
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/waripopir-zivut-zebewukow.pdf
    • https://zowukudikumo.weebly.com/uploads/1/3/1/3/131382828/bukodasexajewomap.pdf
    • https://luxisawevevolal.weebly.com/uploads/1/3/2/6/132682936/latijas_laxebil.pdf
    • https://cdn.sqhk.co/mamevugixej/Ig7ijig/nelepig.pdf
    • https://cdn.sqhk.co/baxorurifina/ifhh8tR/votewunigujodutujekuxeg.pdf
    • https://cdn.sqhk.co/vujaderaz/cw8VEjg/mikecrack_minecraft_como_descargar.pdf
    • https://cdn.sqhk.co/loganidob/hfjb05r/minecraft_download_windows_10_free_full_version.pdf
    • https://static.s123-cdn-static.com/uploads/4485579/normal_5fcd2679e7d26.pdf
    • https://guxovegetixewaz.weebly.com/uploads/1/3/2/3/132302910/f562860b3cbab63.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xuxirifuv.rf.gd/78451540640.pdf
    • http://vemesivudaro.epizy.com/84065056409.pdf
    • http://jojexapopexevof.epizy.com/duwuvaxotapojivejado.pdf
    • http://redexini.epizy.com/xusawaripadujatef.pdf
    • http://badememaveg.rf.gd/47111869725.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_off0000e07b.bin
5ea3e3ea1b6a59fda50db9f7e00fe1bb8b12fb965006dffa524ac40a1bc706d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 5460 bytes
font_01_sfnt_off0000f2ed.bin
4a7fae8368a3ce383cc7164efb11599c28ebfaf5bcdc9822db3322439f94c09f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 10732 bytes