Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25dbd973ccf9ed0…

MALICIOUS

PDF

69.3 KB Created: 2021-02-22 18:25:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 66b4913ca5b1fbb22de1d10bf7b85038 SHA-1: 9faabebad41a863eb4ebc74a84dae50c0c944bbc SHA-256: d25dbd973ccf9ed0870287dc6b9dd0a809ce90c79cd5351a9e423c1c7999c085
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://jacksth.ru/123?utm_term=the+checklist+manifesto+how+to+get+things+right+audio PDF link annotation
    • https://rixevabibevata.weebly.com/uploads/1/3/2/7/132710753/5238677.pdfIn PDF document text
    • http://ejqy.com/indesign_template_free_cvdm2ir.pdfIn PDF document text
    • http://familyit.info/28976057796wvykk.pdfIn PDF document text
    • http://fishland.store/injustice_gods_among_us_mobile_mod_apk2d7bf.pdfIn PDF document text
    • http://arthromedshop.xyz/147110110278i8fn.pdfIn PDF document text
    • http://ezfix.asia/butexedebuluxanonutoruwexp1i1w.pdfIn PDF document text
    • http://imedo.ru/fubibonejazixedonidisamejd8fz9.pdfIn PDF document text
    • http://inostrana.com/gravity_falls_season_3_release_date83pcu.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hejd6ab/4_pics_1_word_photo_album.pdfIn PDF document text
    • http://idealica-co.site/download_game_souzasim_drag_race_mod_apk_terbaru6k17l.pdfIn PDF document text
    • http://nutristrike-shop.ru/99240709471tl3lu.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/repodukiwox.pdfIn PDF document text
    • http://itrom.fun/pelomububerupipepebiseq8meu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/strength_to_write_in_appraisal_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/convert_photo_to_watercolor_painting_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/kipapuzozisoveragalini.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_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 5540 bytes
SHA-256: 6b1fa7eb84a837409b8cfbf7521113de8f75991fea1aa742a2aaccf440e81c1a
font_01_sfnt_off0000e410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE410 10776 bytes
SHA-256: f6105f7d25bb54ccf70dccb5eb6da1e51e8bbbf6a136b8836d23f459e9a734f0

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