Malicious PDF — malware analysis report

Static analysis result for SHA-256 51907e3507672f3f…

MALICIOUS

PDF

59.9 KB Created: 2021-03-18 13:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b96e1d26ad5002d2a5fe04eb641ccd6 SHA-1: ce8a1192168e1dc5ca10c5097a258def18d2fb55 SHA-256: 51907e3507672f3f587a9e99c9fcb089f7d9ffa83d8a6848ebb1ce39bcf03d22
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to obscure domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9728

Heuristics 4

  • 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
  • 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://gimoguvi.ru/award?keyword=cub+scout+leader+guide+pdf
    • https://cdn.sqhk.co/zidulibu/dfjggcX/fuwir.pdf
    • https://cdn.sqhk.co/ropobemuma/uObhdwk/samsung_tablet_internet_browser_not_working.pdf
    • https://cdn.sqhk.co/wosepimi/Wxicgh1/97851096989.pdf
    • http://vezagoxutejoza.66ghz.com/sewadulekovakerizaxu.pdf
    • http://figironeme.22web.org/aprender_frances_libros.pdf
    • http://songkfrk.site/end_of_the_world_movie_2018_wikilwt9r.pdf
    • http://xumukekuvag.22web.org/lipogetuf.pdf
    • http://saudiautoinsurance.com/boxing_star_1._7_2_mod_apkkhqp5.pdf
    • http://verification-help.com/magad8u7un.pdf
    • https://cdn.sqhk.co/babakobesuxe/Scr0Zji/principles_of_membrane_transport.pdf
    • https://cdn.sqhk.co/vovewotutal/qeoHMjj/zagumuvunor.pdf
    • http://goldenframecollision.com/free_bearded_man_vector5zivx.pdf
    • https://cdn.sqhk.co/borefigux/Wgdbhgs/wingsuit_flying_top_speed.pdf
    • http://teksol.xyz/22973567628q8nh1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_2da80c5eb1d343dc841ba96d81b35ac5.pdf?index=true
    • http://zerujafulo.rf.gd/fanuvokusax.pdf
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_1368c7f1ceeb4955b7e215790126589a.pdf?index=true
    • http://rogofijanititad.epizy.com/stock_market_analysis_report_sample.pdf
    • http://kixotominakoze.epizy.com/importance_of_job.pdf
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_8ed1a983dc324b7cbfd2d0b4c0272e0f.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd27.bin
1f316a12c2d299928afe95929accf8a1bf0e2f66e79aff3bda35477642106531		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 5368 bytes

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