Malicious PDF — malware analysis report

Static analysis result for SHA-256 665fe900760a28b6…

MALICIOUS

PDF

98.8 KB Created: 2021-03-24 06:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 194e07d92906b0c2105f58554f81eb68 SHA-1: d0d3330ebe59be4209c5e5a85ee249d22a094d72 SHA-256: 665fe900760a28b693df86a0369d1d438bbafef735d9b811b0fdd683025e5b65
192 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://yafferge.ru/wix?keyword=salt+and+sanctuary+trophy+list'. Heuristics indicate this PDF is a link farm on disposable hosting, designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/wix?keyword=salt+and+sanctuary+trophy+list In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_6052b8d047975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_602909ee97775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477877/normal_6010698e90958.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/approaches_to_social_research.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/83571478249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478422/normal_5ff198aab4e0f.pdfIn PDF document text
    • http://xizerunax.scienceontheweb.net/54197581014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485807/normal_602069c0c0add.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5785c60d-62b0-477f-87b3-088731ac13ea/what_is_cognitive_theories_of_learning.pdfIn PDF document text
    • http://tajavuminona.atwebpages.com/jesapigakogokufuzunig.pdfIn PDF document text
    • http://bomajada.epizy.com/29072991236.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/18035932315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c29ba12-76f5-4780-be51-5253f781665c/epson_artisan_1430_ink_pad_reset_utility.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/how_to_make_a_real_christmas_tree_look_fuller.pdfIn PDF document text
    • http://rexalovujomorox.epizy.com/jitepemawekaxifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab594fa-1968-4639-8853-74bc7fde0d6d/what_is_general_theory_of_relativity_for_dummies.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/human_resource_management_ppt_template_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d442731-4700-4743-9b02-a526127897bc/linksys_router_wrt160n_speed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ce2580d-84da-48a6-860b-0f6c1d7678f8/vista_20p_installer_code_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/gajakorixepaxixe.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/migaz.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_off0001475a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475A 5364 bytes
SHA-256: e096bba5440b1372148b4b624985e21f0f28376f5dfe7c3e54bb312d4026dfef
font_01_sfnt_off00015996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15996 10532 bytes
SHA-256: 410d92c13ecc0452055055b85ef06c6e43bb37beb6be78b3188def4d04d1bdcb