Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bde505aec14848…

MALICIOUS

PDF

74.4 KB Created: 2021-05-01 09:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1cee13874738288366461e9d962714cf SHA-1: b28479cd0cbf50676abd36780f118cbf4683ab78 SHA-256: c1bde505aec14848f6c929739f7de392d8225d27e7fdd33c3059047c511b30a1
136 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI and is flagged by multiple heuristics as a phishing lure. The PDF_SEO_UTM_REDIRECTOR_LINK heuristic indicates it's designed to trick users into downloading content, which then redirects to a malicious site. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://golowaki.ru/strik?utm_term=pentair+superflo+vs+owners+manual PDF link annotation
    • https://cdn.sqhk.co/votawusebak/OzP1jg1/seinfeld_wig_master_full_episode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_6014956a5b8c2.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/hfjcige/43527898492.pdfIn PDF document text
    • http://viziziziv.mywebcommunity.org/cascada_de_coagulacion_veterinaria.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/ihfjd6A/cartoon_network_arcade_apk_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/elSLWgd/cheats_for_sims_4_ps4_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/panajevem/NhfQhhn/90682543950.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/hVifkX5/13514881498.pdfIn PDF document text
    • https://cdn.sqhk.co/xesofosirija/Gheibs8/zazok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416675/normal_5fcf5904422a8.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/examenes_cae_cambridge.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwatak/ivjgzlx/marshmello_real_name.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/dmqNaji/remufesaruluzowuzulaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/object_oriented_analysis_and_design_interview_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/is_there_going_to_be_a_part_4_of_the_maze_runner.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/jupevewavavuxexidefew.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/azonix_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/oracle_database_11g_installation_on_redhat_enterprise_linux_7.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/xugojaxomediniwenumixe.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/estudios_epidemiologicos_experimentales.pdfIn PDF document text
    • http://runuwug.myartsonline.com/16534712463.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/book_the_sense_of_an_ending_by_julian_barnes.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_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 5200 bytes
SHA-256: 78830986c2161acb98b264249c2a2285857c81fc4fb6e069393d5b7ed50b1346
font_01_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 10556 bytes
SHA-256: 789353fe0d5351114b83516cdad218d548e9cd7f9debe5eef70402c311f77979