Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21e52b6332d6bed…

MALICIOUS

PDF

72.5 KB Created: 2021-03-01 21:59:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5f19a8afb199abc2274b14361d71f6f8 SHA-1: 2c787c9bd231822722007cedff216ad895a84e93 SHA-256: d21e52b6332d6bedf44eee1a15f03283c7cd9115c9c5eb960c1582cdb34f0b73
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect the user to malicious sites.

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://xajibur.ru/strik?utm_term=hoover+windtunnel+3+pro+pet+cord+rewind PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392660/normal_6020b0a1e66e0.pdfIn PDF document text
    • http://mattelipsticks.site/70387539672vu41f.pdfIn PDF document text
    • http://rebelliona.online/best_zojirushi_recipes3ed5w.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/is_there_a_fios_app_for_apple_tv.pdfIn PDF document text
    • http://technodom11.com/birthday_song_for_brother_with_namedtpji.pdfIn PDF document text
    • http://vk-settings-change.online/wazigulidewinixijuntzg8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5ffad816e0619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_5fd1315c13f52.pdfIn PDF document text
    • http://verification-help.business/nelusamowowkc0ma.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/93149483629.pdfIn PDF document text
    • http://milesnires.xyz/1880747649901u60.pdfIn PDF document text
    • http://nigasheff.xyz/what_size_file_for_3_8_chainsaw_chainaxq8f.pdfIn PDF document text
    • http://klossheff.xyz/game_anger_of_stick_5_hack5zyed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvodix.myartsonline.com/joloviwexajedesotezo.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/google_ebook_er_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/weather_report_dibrugarh_forecast_7_days.pdfIn PDF document text
    • http://pujumek.myartsonline.com/5832250301.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_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 4956 bytes
SHA-256: 756e3f2f6ed5404c086d91e6098b0c021087263ab685da8eb5a0428022b8dddd
font_01_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 10952 bytes
SHA-256: 13d5b1cf2ac016187dec77e523a6d9f41408df1cf1e497041ef200cee4c9b1f0

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