Malicious PDF — malware analysis report

Static analysis result for SHA-256 9511eed1013bbd85…

MALICIOUS

PDF

69.6 KB Created: 2021-01-25 15:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 61e1c8840cc0a41fc29f140fd9dba5b5 SHA-1: eac1cf6fa89d05e5059b92bd2a74ab49edc3a04a SHA-256: 9511eed1013bbd8508fdd9230bc84435af162cb3302cf920e3480d6a102d7046
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/wb?keyword=ice%20princess%20full%20movie%20free%20online%20no%20download PDF link annotation
    • https://cdn.sqhk.co/futevanu/b9pWPih/turazozoneba.pdfIn PDF document text
    • http://wbigs.space/super_maker_go_adventure_new_games_2020_ps4ili80.pdfIn PDF document text
    • http://hookup666.site/semanekimepopivajibuvipepg1bko.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/fgeic1v/mcdonalds_breakfast_menu_oatmeal_nutrition.pdfIn PDF document text
    • https://cdn.sqhk.co/pabukerofo/Xge2hr0/snakes_on_a_plane_trailer_deutsch.pdfIn PDF document text
    • http://pawosevisipe.iblogger.org/61407852098.pdfIn PDF document text
    • http://reactivascotia2020.com/new_fruit_pop_bubble_shooter_mod_apkgdnn2.pdfIn PDF document text
    • https://luxaxezasu.weebly.com/uploads/1/3/1/3/131398230/kusoxuxedupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwarikufaz.epizy.com/iata_airline_industry_report.pdfIn PDF document text
    • http://zatafefot.rf.gd/los_angeles_times_homicide_report_2016.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/sidazunubow.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/29295312127.pdfIn PDF document text
    • http://vanakodezifezuv.epizy.com/bikroy_apk_uptodown.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_off0000d232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD232 5388 bytes
SHA-256: 1bb78d15fadd5bf033577ab93f13cefedd4d9e4217fc1f882a36ce66eee71aab
font_01_sfnt_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 10692 bytes
SHA-256: 01ac29c42bb9cb8b87a66f357039d74386d95d41b54c7607e7b2213e76c25599

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