Malicious PDF — malware analysis report

Static analysis result for SHA-256 840fbf5fe53f7313…

MALICIOUS

PDF

78.3 KB Created: 2021-03-24 09:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7b1517b70ec7c4fbd3381f519ba7775 SHA-1: d361717dd435cafd9d32396ccd93ed1ec2abe5ff SHA-256: 840fbf5fe53f73135acf40f976933d7badd1c27c474750f48f37813ba89d5429
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains heuristics indicating it is a phishing document designed to trick users into installing a browser extension or update. It also contains a large number of external links, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/123?utm_term=template+for+google+chrome
    • http://gprofights.ru/15228476434bkn04.pdf
    • http://bafedudovodamo.medianewsonline.com/xidodagaduzosugudubi.pdf
    • http://limons.space/kms_office_activator_freehn4wu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zuzopejorexa.onlinewebshop.net/96883011916.pdf
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_1290c76cda5444c19ba556952300d7a0.pdf?index=true
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_768e56fd3e9a48e19d70171ccfae1259.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2f01dfb4-5b34-43b7-9f2b-436536c77211/how_to_auction_on_monopoly_ultimate_banking.pdf
    • https://uploads.strikinglycdn.com/files/bff8d8b7-cdef-407e-836f-f419cd014877/how_much_does_fedex_customer_service_pay.pdf
    • https://uploads.strikinglycdn.com/files/a8ccb21d-ff40-4c59-863f-2d6aa89707bd/how_to_insulate_lay_z_spa_pump.pdf
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_70aea634b6744b1082d7a4d6c52d5d5e.pdf?index=true
    • https://s3.amazonaws.com/jajoxulabojaso/rekojivuxivovafemegifiras.pdf
    • http://pelebirepopo.onlinewebshop.net/45949448680.pdf
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_ef55fabe22a547dbb4e81d6d722f6078.pdf?index=true
    • http://xolavozezimodan.onlinewebshop.net/dragon_age_origins_best_class_for_archer.pdf
    • https://uploads.strikinglycdn.com/files/96bcf6a9-201d-4ec3-9a42-ed5a72a64c38/64949974257.pdf
    • https://s3.amazonaws.com/lomogas/lelofijevim.pdf
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_d43d297c10b1494cb2a2024bc35edc1e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/690e683d-09eb-4f53-85f1-aea5cf03e33a/pesevapoko.pdf
    • https://uploads.strikinglycdn.com/files/01a984fc-8afa-4ab0-b694-ce9aee67b39a/litejomoxalukuxisil.pdf
    • https://uploads.strikinglycdn.com/files/46e29ec1-6aa5-460c-8a2c-de0eec1aa776/zawusavuzudovezeroge.pdf
    • https://uploads.strikinglycdn.com/files/2192d344-1708-49d7-a0da-60ceee4095d2/zodaxo.pdf
    • https://s3.amazonaws.com/welanisowari/bullet_bike_photo_wallpaper.pdf
    • https://s3.amazonaws.com/nefomojuwet/pardesi_anthem_full_hd_video_song.pdf
    • https://s3.amazonaws.com/gagagakigibapo/fuwovobu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87e.bin
b5df3398c83f68bab42664715ca0e2e4c04195da4e5f0070d501be110f334436		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 4832 bytes
font_01_sfnt_off0000f8f1.bin
f331e5ce4072a901d9dbc83f159b294f3ad394d04bdc9ce5b047e8d0a9e5a4fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 10732 bytes
font_02_sfnt_off00011da7.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA7 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.