Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f4de21dc47eb9a…

MALICIOUS

PDF

77.4 KB Created: 2021-03-24 10:23:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 876955dadb2a6af9b55dd71fd32a9500 SHA-1: 407382f16e1e0cf5780e344d0d4bada37882a34e SHA-256: d9f4de21dc47eb9a186a5e9cb0f88760915cb1383ec1bf7d87cf8e5586e534ce
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 0.9991

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://jumiwimov.ru/123?utm_term=lebenslauf+auf+englisch+formulieren PDF link annotation
    • https://cdn.sqhk.co/parabeset/hggeic3/traffic_tour_2020_mod_apk_download.pdfIn PDF document text
    • https://bofeliwibetu.weebly.com/uploads/1/3/2/8/132814086/lapigijapoxo_jobapa_rokad.pdfIn PDF document text
    • http://wegutamozeji.iblogger.org/buwasi.pdfIn PDF document text
    • http://wabaxifejem.sportsontheweb.net/36311425339.pdfIn PDF document text
    • https://netebina.weebly.com/uploads/1/3/4/5/134596662/gajufilipaw.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/d8Yighd/the_happiness_planner_printables.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/35325549951.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/GibiiFI/paint_by_number_free_coloring_games_color_book.pdfIn PDF document text
    • https://cdn.sqhk.co/xadopazo/o5mIhhj/create_a_todo_list_app.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/vudija.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/mezupogoregepuge.pdfIn PDF document text
    • https://rukutatonaneto.weebly.com/uploads/1/3/4/0/134012616/lodezaxizam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_68bea2f1ef1d45298ac89dac0afa3b49.pdf?index=trueIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_0dad1ae3c9134847858bb1403a79f675.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_037e6147cf324382af9158d833b14895.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luborinizu/86134993125.pdfIn PDF document text
    • http://sokekakeloji.onlinewebshop.net/excel_advanced_skills_writing_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/worudonopidiragivubeweto.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/39390375370.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_901719e4a19a4317849000f9bcf48b1b.pdf?index=trueIn PDF document text
    • http://zinimivozu.rf.gd/belimunumomoz.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_f977419909be4631b02e51405b994d97.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/bleached_wood_platform_bed.pdfIn PDF document text
    • http://dakatowase.epizy.com/zixovanox.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_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 5376 bytes
SHA-256: 98af78d04007c52b95a7490bdd2c612c0cfad1fa1d36928e1891a6341337c18f
font_01_sfnt_off0000fe85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 12004 bytes
SHA-256: 44dc860c7a041636a721921a046261040e7f1652564198fadc62d556a18c10cb