Malicious PDF — malware analysis report

Static analysis result for SHA-256 b231b5aa05a94d2a…

MALICIOUS

PDF

68.0 KB Created: 2021-02-11 12:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1e539dd2fb2f08e795fdf66062a6a4fd SHA-1: c1791790691dbc994e747cdefb09aca184bdcf1c SHA-256: b231b5aa05a94d2a5cdbd9181516b820d52c99454c69f30b363210a8511e790c
96 Risk Score

Malware Insights

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

The file is a PDF containing multiple embedded URLs, one of which is flagged as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://maypoin.ru/123?utm_term=des+moines+christian+school+teachers PDF link annotation
    • https://cdn.sqhk.co/fefuxumito/ihhaUjf/ditoxitozanudavebanol.pdfIn PDF document text
    • https://cdn.sqhk.co/bidamasegom/3UMjgDX/mobcup_ringtones_and_wallpapers_free_download.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/august_calendar_20198v3lc.pdfIn PDF document text
    • https://cdn.sqhk.co/livoluxuwad/n6gifAP/10070378575.pdfIn PDF document text
    • http://raisinshq.club/lujixetikiwulorekusiczkhl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_600a68a31dfab.pdfIn PDF document text
    • https://cdn.sqhk.co/buwisotubu/bdGhiib/ted_cruz_supreme_court_book.pdfIn PDF document text
    • https://cdn.sqhk.co/duxafanuke/H1KgjzD/ham_radio_course_online_free_uk.pdfIn PDF document text
    • http://zalewef.iblogger.org/38113514267.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/dugiief/56145836339.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/nrgghgh/hd_camera_for_laptop_free.pdfIn PDF document text
    • http://circulyarkadigital.xyz/losizosoxezibugavipewg2u1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/a_s_name_whatsapp_status.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/vusas.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/73428732861.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/apache_openoffice_for_android.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_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 5036 bytes
SHA-256: 1351d3994d2a426767027abb2f060825dda349c05db29359d561c9fd89e86770
font_01_sfnt_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 10172 bytes
SHA-256: a9605b06807a36fa46e6edb4b5979adbca12c3cb6defc14b88245506e6f8101b