Malicious PDF — malware analysis report

Static analysis result for SHA-256 be43e864a7e0e9ea…

MALICIOUS

PDF

77.7 KB Created: 2021-04-03 20:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bb626bb6b661ece17de9308018e645a SHA-1: 6823ffac06a14d5d65323bf4a6fe697b48ace30f SHA-256: be43e864a7e0e9eae5f9d79fcd601224a783d343fe9e801a35f4dd7191b3a76b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious destination. No scripts were extracted, but the overall structure points to a malicious document delivery mechanism.

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
  • 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 http://lulamugateso.mypressonline.com/business_law_course.pdf
    • http://bidizujimon.getenjoyment.net/tabidepodigovo.pdf
    • http://tupaxeguna.scienceontheweb.net/diabolik_lovers_manga.pdf
    • http://mojadejazisapa.sportsontheweb.net/39867798146.pdf
    • http://jorowijedo.mywebcommunity.org/rofekalifotaxowewinesuto.pdf
    • http://kenugizi.getenjoyment.net/11216114216.pdf
    • http://wotukujis.sportsontheweb.net/advertising_company_profile_design.pdf
    • http://laxogapajoze.getenjoyment.net/sociology_syllabus_2020.pdf
    • https://dowevatubewud.weebly.com/uploads/1/3/4/9/134901186/kenuwuzebagev-sekav-tapos-nisonerugotilo.pdf
    • http://zoguponuwuxoli.medianewsonline.com/44246202384.pdf
    • http://pivolirarorip.mypressonline.com/machine_learning_vs_deep_learning_salary.pdf
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/dalunuw.pdf
    • http://pazadixokumox.sportsontheweb.net/casio_tough_solar_g-shock_watch_reviews.pdf
    • http://kolagozisil.mywebcommunity.org/96841100941.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Ecv9gJ3Ok6E/wb?keyword=lexus%20gx%20460%20specs%202018
    • http://sitafefisoju.atwebpages.com/apj_abdul_kalam_history.pdf
    • http://nuwadolonopip.onlinewebshop.net/lirezufubupaguk.pdf
    • http://kuwitabetegipo.myartsonline.com/will_there_be_a_season_2_of_girlboss.pdf
    • http://sasukagisodubex.onlinewebshop.net/96901190844.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef48.bin
0a573691712e6473120cbaa680433ac398e23c9299c8cb6148968d1be7dc6cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 5532 bytes
font_01_sfnt_off0001025e.bin
9a55befa280f8e25922c0436442f46b94b45af17ea5e3cc5b6461e17a8b880e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 11556 bytes

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