Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b078d15d21e83a0…

MALICIOUS

PDF

82.2 KB Created: 2021-03-15 11:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 351c844e5771e5b5355c4bc1e967a400 SHA-1: bc8ef544c032bf7499f476a8c4e8bafd6c4b079a SHA-256: 2b078d15d21e83a084a8c629c3895246add40f7117c677ba86df0b7a8f8dc32f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model also indicated maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or to redirect to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, suggesting a malicious intent to distribute links.

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://seumenha.ru/strik?utm_term=how+does+culture+influence+our+cognitive+development
    • http://detonic-de.website/how_to_increase_render_distance_in_minecraft_realmslwhmz.pdf
    • http://netzamka.ru/kitchenaid_stand_mixer_sale8s280.pdf
    • http://train-home.ru/49498015046k7nv2.pdf
    • http://blacklaser.ru/how_long_to_cook_salmon_on_cuisinart_griddlerbk3hz.pdf
    • http://reduslimitaly-ufficiale.site/92058641899uewvg.pdf
    • http://walkover.me/86942861496fvnyf.pdf
    • http://obzorov.site/is_null_or_empty_crystal_reportssfc30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lotibabakuj/bitadokovevidesaxube.pdf
    • http://dikumetuvo.epizy.com/xalamomodizuwabilabeno.pdf
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_af4a9a2f4c1549a29371b5256b527f00.pdf?index=true
    • https://s3.amazonaws.com/petubapizo/sepawoxalojubav.pdf
    • https://uploads.strikinglycdn.com/files/975b505d-606f-452e-96f8-6380b1916e70/8718362177.pdf
    • https://uploads.strikinglycdn.com/files/94c12ea7-c0c7-46a7-9cfb-68f08a87f0cf/series_of_unfortunate_events_book_1_reading_level.pdf
    • https://uploads.strikinglycdn.com/files/21dd820f-fb54-4f18-b416-cd4c0bd1d2b5/all_american_canner_sizes.pdf
    • https://s3.amazonaws.com/vipinib/development_tools_for_android.pdf
    • https://uploads.strikinglycdn.com/files/596b9b56-8d56-4212-8c8a-180ad611f657/who_has_the_slowest_40_yard_dash_in_nfl_history.pdf
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_729b970880fe4383b9a9507ddb18542d.pdf?index=true
    • https://s3.amazonaws.com/zufojadibi/dapikururag.pdf
    • https://s3.amazonaws.com/pewebopufupe/vobexipob.pdf
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_0e019373f9fb4674bffdbbf4aa027a8f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/90a42593-f164-4f84-ad6a-5d8bdc75facd/plt_voyager_legend_pairing.pdf
    • http://judomumofu.rf.gd/what_is_social_media_anxiety.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_off0001027b.bin
811f057b31d2ffb0013bbc62c6fe913769a4efe80418cdd11b557aea0d359e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 5376 bytes
font_01_sfnt_off000114d1.bin
3076fabeb6e26ecb4c3425cf6daa14c0a3227071d906c95d9b641384cd630ba6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 11216 bytes

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