Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b0ff8844e89391…

MALICIOUS

PDF

75.4 KB Created: 2021-02-20 05:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a787bef849b0b288c8310ca09e6a7a5d SHA-1: 71e58952ac5b9e4e5c7665cba01557a5f8a9137b SHA-256: 21b0ff8844e893910d1cb1b979000b9c4fac232e05eee6812963453f880d6f93
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to disposable hosting or known redirectors, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to harmful content or malware downloads. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=el+nombre+de+la+rosa+pelicula+personajes+principales In PDF document text
    • https://cdn.sqhk.co/wepurodapike/AiaiX07/44141034180.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/JydKhcl/81753273614.pdfIn PDF document text
    • http://dodemawaj.iblogger.org/bleacher_report_spurs_ajax_highlights.pdfIn PDF document text
    • http://vasowenotaruso.22web.org/93455265674.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/2idnhaV/ladorowa.pdfIn PDF document text
    • http://differencecheats.net/4_genres_of_literature367xv.pdfIn PDF document text
    • http://rawuzexo.iblogger.org/facebook_messenger_all_old_version.pdfIn PDF document text
    • http://websporizle3.com/74964093929pupb7.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/hicgiMD/epic_minequest_episode_5.pdfIn PDF document text
    • http://doruguduku.iblogger.org/dragon_quest_builders_2_guide_ign.pdfIn PDF document text
    • http://laitlabs.pro/5340221057ptqen.pdfIn PDF document text
    • http://pabulaluxe.iblogger.org/marble_board_game_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daxepusiz.rf.gd/limits_involving_infinity_worksheet.pdfIn PDF document text
    • http://xirixoxixewop.epizy.com/uc_browser_handler_apk_free_internet.pdfIn PDF document text
    • http://zusunikumejimet.rf.gd/37079909980.pdfIn PDF document text
    • http://sopexas.epizy.com/marks_and_spencer_jobs_application_form_login.pdfIn PDF document text
    • http://vibiwarufade.rf.gd/miso_pin_full_form.pdfIn PDF document text
    • http://kirogebi.epizy.com/stefan_de_la_barbulesti_colaj.pdfIn PDF document text
    • http://ridatemukaten.epizy.com/70408482693.pdfIn PDF document text
    • http://juzujodajemafa.rf.gd/backyardigans_theme_song.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_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 5392 bytes
SHA-256: e8376073e3b4c05027c694a95caf9a238b60858d0eb75f6e08fb7f7ada146b74
font_01_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 10876 bytes
SHA-256: 82af2eb4944c22c977fac4bbdba13de86cc654dcd3b1c5aa4225ae056fbd03ad

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