Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fd5cc0a921366a…

MALICIOUS

PDF

74.6 KB Created: 2021-03-05 08:39:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0e40309487a5a90f914736648366afea SHA-1: 20cac9a4bcb47ac284397897823d4c785fb025d5 SHA-256: 57fd5cc0a921366ae1f6f57ab28af8435874dc52b65f64fda39926930316f117
194 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or exploiting vulnerabilities. The embedded JavaScript is likely used to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://resalured.ru/123?utm_term=bissell+proheat+2x+manual+9200 PDF link annotation
    • https://cdn.sqhk.co/keserina/FXjedgd/lolani.pdfIn PDF document text
    • https://cdn.sqhk.co/suxumeva/iigjehi/19391555613.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/iIQijbh/73139393588.pdfIn PDF document text
    • https://cdn.sqhk.co/fasazani/iuWgSij/1980s_rock_and_roll_music_videos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fivubero.epizy.com/71750544813.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_a7f15ba832724f2a85392e69e73bffe4.pdf?index=trueIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_21443749239a44999aee2147e981b8ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5a5310-056b-4d1a-97a7-fcc5bd76d79d/tamil_sivapuranam_full_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7cbc73-37c7-45df-bbc7-c120f8cef21e/wemuveririvamufeminufe.pdfIn PDF document text
    • http://menenig.rf.gd/nous_informer_sur_l_tat_d_avancement.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_f3100a4aac9544fe910579a626a04554.pdf?index=trueIn PDF document text
    • http://pemupenox.rf.gd/corsair_commander_pro_setup_guide.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_218e70f76e1e421497ffa9e0e423d66b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91df1789-86ab-4e89-a3f5-a9dda8d4f373/othello_act_1_scene_3_summary.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_cc13ba5cab0542d59d1dde7c68c76c66.pdf?index=trueIn PDF document text
    • http://robowogutalopet.epizy.com/actualiser_les_formules_excel_vba.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_81523243042840db9fab62d69548d91a.pdf?index=trueIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_92f83ccc63584407bfe3d9be5c67c16e.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_f79ce01035f54032b197e38ea9d99884.pdf?index=trueIn PDF document text
    • http://jizemefuzix.epizy.com/sri_vishnu_sahasranama_stotram_in_hindi.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_60f93b6450fb4f1c97b851bff47ff772.pdf?index=trueIn 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_off0000e6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 5604 bytes
SHA-256: 03b5a532f06b5960a031af3464858a05878fd7b420e290dfe1c2e83cd112168d
font_01_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 10376 bytes
SHA-256: fff898240f198e4891f7df5ae3547573eeedd07adf805c39ab6f912e543c98e2

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