Malicious PDF — malware analysis report

Static analysis result for SHA-256 92deeb6cc145524a…

MALICIOUS

PDF

73.9 KB Created: 2021-03-07 20:06:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1537ca87c65504eb8f503b472b71ff4a SHA-1: 6c4835f2bbc670c03273b138b61a7c9bcd3028ba SHA-256: 92deeb6cc145524a765dd6724ccc86eb2839f913bac8f4e009685163ad142b50
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to other PDF documents hosted on various domains, some of which are associated with disposable hosting. The primary purpose appears to be SEO manipulation or distributing further malicious content, rather than direct user interaction within the document itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://druttle.ru/wix?keyword=electrical+power+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5ffd6e8de1f24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_6035293e64938.pdfIn PDF document text
    • https://bavipakodotem.weebly.com/uploads/1/3/5/9/135958795/xowifulugepig.pdfIn PDF document text
    • https://goxesepejapumew.weebly.com/uploads/1/3/4/6/134609979/9c9b5f15e3236b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501791/normal_603ecd42b2d03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455657/normal_60322efd7a0cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413007/normal_6019684eb02f2.pdfIn PDF document text
    • https://rezemofojo.weebly.com/uploads/1/3/5/3/135321986/wuxomonowol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475406/normal_5fefe82a94273.pdfIn PDF document text
    • https://jomagikovire.weebly.com/uploads/1/3/1/4/131408086/82c840dc6c2.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/suwowiribinezobaxoxudiwop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418574/normal_60434c6747107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416322/normal_5fd06af1d7b92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407064/normal_6008faf32fd8a.pdfIn PDF document text
    • http://memiwuv.mygamesonline.org/yoga_poses_to_help_with_constipation_when_pregnant.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/098dcbdd-9084-4c94-b188-70755c7c1164/t-fal_nutricook_pressure_cooker_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f4b2b2e-d077-4310-bc2a-01019720097a/how_to_say_folk_music_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89249cbe-3018-4fc8-8479-7f463af26abb/tesarebaxoxerebidesaleve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17447a40-3ac8-4f04-a972-f17f73f8a05e/ponuwobat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a988eb3-0496-4b24-a36d-a1a3bfd793ce/jepapifasaledupipoxotik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a324fa-55bf-42ad-ae3a-a173425a4af2/lofetexemug.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_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 5132 bytes
SHA-256: 269649979ddfe130a85f1dc65a43d59bfb018ef75c2ed9930f595b97c63fb768
font_01_sfnt_off0000f7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D0 10188 bytes
SHA-256: 9ccd3377480c7c60ae6844074fd2b5a866e19b295142a4117a3cbd79844783e9