Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a52a45431fcb98…

MALICIOUS

PDF

93.0 KB Created: 2021-03-15 16:39:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 789410fea0d0170580c8ef5884eec71c SHA-1: 5393d519a5d2304ff56371ea8d311a007a43c157 SHA-256: f7a52a45431fcb9831be589b51490b4585e40b4f641355479709734bef6b9f71
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/123?utm_term=bard+college+campus+map+pdf PDF link annotation
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/nepoz_zogiguloretel.pdfIn PDF document text
    • http://kumaboperituf.22web.org/90025156494.pdfIn PDF document text
    • http://dasuwupozu.22web.org/reforming_the_incorporated_societies_act_1908.pdfIn PDF document text
    • https://gazevasodixobex.weebly.com/uploads/1/3/4/4/134437076/degim.pdfIn PDF document text
    • https://wipukanutunuk.weebly.com/uploads/1/3/1/4/131437017/2354426.pdfIn PDF document text
    • https://wozijosetat.weebly.com/uploads/1/3/1/4/131407158/vimasowofafevixawaw.pdfIn PDF document text
    • http://xonukab.22web.org/physiology_of_auditory_system.pdfIn PDF document text
    • http://gulexamotapa.iblogger.org/24099020926.pdfIn PDF document text
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/wegogudugebekaleb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_008ab34c86134aa39dc2da882e7fc705.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40883b96-6dd1-4629-b65e-fa04cc04ac49/4931021969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46aa4e1b-506b-47ff-af36-b63c5626ece2/58050162302.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/able_cartoon_monkey_pictures.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_b5127b64835a49ee836e1ccde5862d4e.pdf?index=trueIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_241676c803504269830f48030cfe47b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/026dd311-210d-4eb2-a050-2a14d5a519f0/diferencias_de_la_mitologia_griega_romana_y_egipcia.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/schlage_connect_smart_deadbolt_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/83040234704.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/35778367135.pdfIn PDF document text
    • http://javozajesaretu.epizy.com/18814971740.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/fovotofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01da17ed-6dff-423e-bbe3-e95223478121/ms_project_gantt_chart_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4602c1e-f6f0-4fbb-b1d8-07c3b1466807/how_to_log_into_my_icloud_from_another_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/26088679348.pdfIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_b72d8602fb154995a79b02e69b3da486.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobito/3206427984.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_off00012c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8F 5524 bytes
SHA-256: 33442d1ddee4124a851128562a8e9846e594d00488e95e625e2bee0f9bf73823
font_01_sfnt_off00013f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F45 11596 bytes
SHA-256: 21ece57aadb7d689906e4cdad545514daad7ced170ba2387638669f58f50fd3c