Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4b54d374c3d843…

MALICIOUS

PDF

79.4 KB Created: 2021-03-25 04:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5f06f2fbcddac789009ce2692b18470c SHA-1: ec38a926894f983b5c8e63e38934f3f7751b3a95 SHA-256: 1f4b54d374c3d8435f8c2441043847cc6c2a676eea6dcb4b3e735a90a0842b42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=blender+2d+animation+tutorial+pdf PDF link annotation
    • http://7gusevshop.space/devil_s_advocate_full_movie_mp4ji3f0.pdfIn PDF document text
    • http://nebatomefov.scienceontheweb.net/accpac_accounting_software_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_60417e085790b.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/chamberlain_universal_remote_genie_intellicode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_6027ccc8645bf.pdfIn PDF document text
    • http://werenntaq.online/spirited_away_wallpaper_gifipsrv.pdfIn PDF document text
    • http://peskomment.ru/49004842750es42w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_6039789766511.pdfIn PDF document text
    • http://vidavapazideni.iblogger.org/xatuvowigotutigevuwi.pdfIn PDF document text
    • http://rewita.fun/wubodirawudusudimoku365g9.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/batho_pele_principles.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/the_book_thief_audiobook_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://deroxemonak.epizy.com/converting_units_worksheet_49_math_092_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/rajaxodaxenimedejita.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/sajawawagisilum.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/descargar_banorte_movil_apk_ultima_version.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_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 5192 bytes
SHA-256: d332dc6804f83edf3a8b54032edc52282150d997ec7d6b2a3e1d2fcabe4b3d5c
font_01_sfnt_off00010c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6F 10628 bytes
SHA-256: d08f0b9cdf5847cc9c8521724bbd6faed65c75f8abc413f6dea8d88e68daec02