Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ef74befdd8878e…

MALICIOUS

PDF

82.6 KB Created: 2021-04-01 08:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eff773e4a602a8aa0758f1cc5a83ae9 SHA-1: 7a3f05478c23de8e4927955e91e204270b438220 SHA-256: 40ef74befdd8878eb7de7355142b19d9d314b941a9332678791ec5cdb5ba3c87
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, appears to reference software, suggesting a lure to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=linux+mint+best+pdf+reader
    • https://cdn.sqhk.co/ganuniwiku/ghigu5q/nalulexosaxobatoxunebo.pdf
    • http://mepamoso.sportsontheweb.net/gulita.pdf
    • http://onlinetiser.website/nosazefazonosupogafumr6wp.pdf
    • http://vevufilusik.scienceontheweb.net/can_t_take_my_eyes_off_you_lauryn_hill.pdf
    • http://tricitysikhs.com/lovolaludezedil7em8r.pdf
    • http://majexifavel.scienceontheweb.net/discrete_and_combinatorial_mathematics_5th_edition_textbook_solutions.pdf
    • https://static.s123-cdn-static.com/uploads/4446166/normal_6001e9db38c17.pdf
    • http://remont-kvartir-otzyvy.moscow/xejufolidasiwaroroww6t5.pdf
    • http://ecoservice-vlad.ru/final_fantasy_16_trailer_ignufc1t.pdf
    • http://housefashion.ru/kilufolokelimolibotz8cbz.pdf
    • http://malespw.xyz/vidoxazanokokogund754.pdf
    • http://oneitstore.info/96325670915nm7uj.pdf
    • http://lnstagramverifycentre.com/download_full_bible_in_englishkec2m.pdf
    • http://sakhavto.ru/best_english_learning_novelsvl8yb.pdf
    • http://watercart.ru/bible_commentary_online_macarthurk6mbx.pdf
    • https://cdn-cms.f-static.net/uploads/4492286/normal_60652f746b3e1.pdf
    • http://wijasagasipode.getenjoyment.net/jowir.pdf
    • https://cdn.sqhk.co/nivipanevi/4Kjbkoa/vegogibunasoru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dexadusoxeb.atwebpages.com/awl_vocabulary_list.pdf
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_49d5425e6980419fa42ac01fa3e24cae.pdf?index=true
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_094c7d2973da49c79a22eebcb8d7290b.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f784.bin
3b2457b80658f1a8eb9370888708caffd1463307831ba997275b26024d43fe04
pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 3472 bytes
font_01_sfnt_off00010411.bin
bdaf43b06ebaa77d2817543aef3359d5510f32aa045f2e934ebf0b5e6fecf2f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 5304 bytes
font_02_sfnt_off00011603.bin
a821bdeb6065f253318e34383b9aa89e920f867f177bbacc66f24bc7eab15458
pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 11320 bytes