Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5be80cc64026fb…

MALICIOUS

PDF

71.6 KB Created: 2021-06-05 02:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f6923631cc184db83406fd1235b504f6 SHA-1: f41dce19b0150cc11a79622b97a26f9e3e5e6531 SHA-256: ed5be80cc64026fb47d2dfb4c2b07711cc5d3c9838f7c927214a135ee4ce4aeb
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent example being 'https://smidgel.ru/pbw?utm_term=hexagonal+rod+weight+calculation+formula'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/pbw?utm_term=hexagonal+rod+weight+calculation+formula PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4456666/normal_60b137724befd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5fe1210ab1c0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405181/normal_602bf66027159.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477163/normal_5fdf6ed995ee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_60b947dbe377e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbf718c-502a-4bda-abfb-bd7e4a5bb9ae/77295449396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd18da12-3356-4477-becc-3c9e55958b83/ralugomavuweliwivonemuli.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/f/is_afro_samurai_backwards_compatible_on_xbox_one.pdfIn PDF document text
    • http://numefen.pbworks.com/w/file/fetch/144634083/grade_11_physical_science_textbook_free_download.pdfIn PDF document text
    • http://liguduper.pbworks.com/f/nch_express_invoice_8.17_registration_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865fb3c0-a45a-4833-9364-9941bea31626/59739811297.pdfIn PDF document text
    • http://nugewil.pbworks.com/f/smeg_coffee_machine_cleaning_instructions.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144603408/livre_en_sortant_de_lcole_exercices.pdfIn PDF document text
    • http://vananizi.pbworks.com/w/file/fetch/144630348/90897252128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ce091dc-98b2-4f13-b605-0a31615bbeb1/gujili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b3c4bb-53d6-4230-a037-791aaad4e852/bhakta_prahlada_kannada_movie_mp3_songs_download.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144419772/les_alphas_livre_du_maitre.pdfIn PDF document text
    • http://kufavuva.pbworks.com/f/how_to_report_lost_umid_id.pdfIn PDF document text
    • http://zolunegoli.pbworks.com/f/wo_ladki_nahi_zindagi_mp3_song_download_new_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e4eea8-bfd9-4de2-b5ca-bb88c1302405/sotomakeb.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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 5376 bytes
SHA-256: b02b571826896e57262deadd5e173435c2ae5f779d53f5415690e353ddc9e01f
font_01_sfnt_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 11320 bytes
SHA-256: 84eedf1e392922972ae040b9280400d48ad41a1cfec63fc2c65ca3cd4d2546b1

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