Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9e4689eb3498d3…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 22:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 29ffe0850e30c2dccf754273f030bb36 SHA-1: f101fbbd7d295c131bb8c3bbbb7264564321d81c SHA-256: ed9e4689eb3498d319616bcdfb584fe20febe2763611f806d9c46641ae2d6c83
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URIs, many pointing to potentially disposable domains, suggests a link farm or phishing attempt. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct textual lure is discernible. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://xajibur.ru/wix?keyword=national+geographic+bee+official+study+guide PDF link annotation
    • https://cdn.sqhk.co/konajera/BW3geie/molitegojejapek.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/certified_ethical_hacker_v10.pdfIn PDF document text
    • http://tolunisusij.22web.org/bandmaster_tamil_movie_song.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/pHia0K1/best_free_ringtones_for_iphone_7.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/Z0Qhdl9/supermarket_3d_free.pdfIn PDF document text
    • https://cdn.sqhk.co/semobisugigi/cieeifY/mobile_classroom_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/Wgfidhh/wajomogisewuduw.pdfIn PDF document text
    • https://cdn.sqhk.co/vugujebeku/giaieji/gmail_sign_in_different_account.pdfIn PDF document text
    • https://cdn.sqhk.co/fegojujor/jbhbdhh/makamosedopiwelef.pdfIn PDF document text
    • http://jibakerutev.mypressonline.com/82866157762.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/whhWigs/pac_man_world_2_gba_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kimawawasero.onlinewebshop.net/how_to_setup_linksys_wrt54g.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/wexugu.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/free_wedding_weekend_itinerary_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/sims_3_pets_expansion_pack_origin.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/adding_and_subtracting_integers_practice.pdfIn PDF document text
    • http://pikakodi.rf.gd/when_should_i_read_the_wheel_of_time_prequel.pdfIn PDF document text
    • http://nokolul.epizy.com/android_auto_start_app_after_reboot.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/xevibinisisaxizutewat.pdfIn PDF document text
    • http://gudugapapilile.atwebpages.com/toxodo.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/maps_for_minecraft_pe_apk_ios.pdfIn PDF document text
    • http://gamofoxil.epizy.com/understanding_human_behaviour_psychology.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_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 5628 bytes
SHA-256: 22343ea4fdedb178fb3def60750352c9fa64c181c7cfadbf7fa7ad7b1053903e
font_01_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 10980 bytes
SHA-256: f8e3293e8c56164f815a2bd62f537747372834a95ae4da1e80c34b35e6dcbbaf

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