Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df37370ec3c9077…

MALICIOUS

PDF

75.3 KB Created: 2021-03-19 12:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 800602fbde86d2a335251d218e22e892 SHA-1: b15462c2364c6df4d6af22c485482f5fec1b9a69 SHA-256: 1df37370ec3c9077e5e62725689ada87dc5f8864de6045a5a5f0c1e73eaf192e
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it contains an external URI and an SEO redirector for "free-download phishing". The embedded URL points to a domain that appears to be part of a phishing or malware distribution scheme. No scripts were extracted, but the overall pattern suggests a phishing lure designed to lead the user to a malicious site.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://kuzutuzo.ru/award?keyword=js+tutorial+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/sugigevapure/iigcZii/the_yellow_wallpaper_critical_analysis.pdfIn PDF document text
    • http://pitushok.space/bapisarolokelomenenimaxart7ah8.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/heqChhv/checklist_template_printable.pdfIn PDF document text
    • http://nuwenipo.22web.org/1992_toyota_truck_owners_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466413/normal_60419be5acf36.pdfIn PDF document text
    • http://fruittea.space/67060727153g9imu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_60411fc5a7753.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/kGijIDs/zedakikizevumasedurap.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/jfrgflb/wanavaxatizapolovederusas.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/ha6ija2/vokob.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/fWFBrYE/gfx_tool_for_asphalt_xtreme.pdfIn PDF document text
    • https://cdn.sqhk.co/gexedamej/iDbhdgd/do_fish_give_live_birth.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/nxjjjcP/the_maze_runner_book_5_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/drdhhjc/4_pics_quiz_answers_level_12.pdfIn PDF document text
    • http://sedovarubabozop.iblogger.org/paded.pdfIn PDF document text
    • https://cdn.sqhk.co/ruradavi/ajjlhah/36052741972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mogojulelazotit.epizy.com/generac_5000_watt_generator_manual.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_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 5116 bytes
SHA-256: 0627f296a4d695b52f6485d6f7eb9618317387a1e0bf83882716a6f45525d846
font_01_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 11212 bytes
SHA-256: 25378d95315b2c95124384f61e0e2c8ef03e985a5cae897ddbdee0ce66f89450

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