Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b7c3fc6199e198…

MALICIOUS

PDF

73.3 KB Created: 2022-04-19 02:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-04-06
MD5: f4373bf857cd4224f4eebd379f1ee95e SHA-1: 6a89c6bdbdd50b82cd561c9475a7b04897300f91 SHA-256: a8b7c3fc6199e198e40798d59816d2d7026453d377a71c4e2e32f10757dffa52
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The document body and extracted URLs reveal a link farm designed to trick users into downloading further malicious PDFs, likely for phishing or malware distribution. The presence of numerous external links on disposable hosting services further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cafij.co.za/YmrXLWy8?keyword=big%20nate%20in%20the%20zone%20pdf%20download%20free PDF link annotation
    • https://nitogufufuwal.weebly.com/uploads/1/3/3/9/133997090/ritexavot.pdfIn PDF document text
    • https://dreamgroupkr.net/FileData/ckfinder/files/20220413_FF158F67C0746017.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/binikiwikadujimeru.pdfIn PDF document text
    • https://sekugarotapoze.weebly.com/uploads/1/3/4/3/134362520/6acef3.pdfIn PDF document text
    • https://zifokodogip.weebly.com/uploads/1/3/1/3/131398222/todopepejik.pdfIn PDF document text
    • https://povoligijiz.weebly.com/uploads/1/3/4/6/134665243/f7b19d58e9.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/rujixadipogifafajewalalaj.pdfIn PDF document text
    • https://vuxubiwuto.weebly.com/uploads/1/4/1/2/141290907/5084610.pdfIn PDF document text
    • https://sowufaxekip.weebly.com/uploads/1/3/2/7/132710719/xanisut_lobud_dixasotuxe.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/xewinirova.pdfIn PDF document text
    • https://nusatugob.weebly.com/uploads/1/3/4/8/134865614/sedutukujaxisi_jovitigarug_rixunuzisogana_dekojidanavumav.pdfIn PDF document text
    • http://gktizein.gr/kcfinder/upload/files/40568001476.pdfIn PDF document text
    • https://sozezitevi.weebly.com/uploads/1/3/4/6/134639304/tedafobe.pdfIn PDF document text
    • https://goxufosoxewuje.weebly.com/uploads/1/3/5/3/135300646/rizuwawefokikos-pefubixawumutan-vakiketigimuk-pebexex.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/23208251646.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/162255cb0d03f2---ragasolivapoxovujap.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/860edc4570ed9455aba7ab8fb4a7d6d2/rowilesoju.pdfIn PDF document text
    • https://pivubetipu.weebly.com/uploads/1/3/4/3/134328131/431aeaaa600.pdfIn PDF document text
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/padaginuj.pdfIn PDF document text
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/6325142.pdfIn PDF document text
    • https://aromamarketing.md/img/files/rulonizaperejunasux.pdfIn PDF document text
    • https://lobavasato.weebly.com/uploads/1/3/1/4/131483685/gijeg-bariludubobi.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://dejavu.sourceforge.netIn extracted file (font_00_sfnt_off0000b5bc.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000b5bc.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BC 17612 bytes
SHA-256: 6025641b20837ae573d8ce459babcf929eb66edc568d7509f45f130e06af09ac
font_01_sfnt_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 10808 bytes
SHA-256: dacac91e696bc6ac564f8257ef7a7fe9a6e87641408dd6b8ce70848d1dc12ba8
font_02_sfnt_off0000fd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1