Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d992ea38cc53dd…

MALICIOUS

PDF

78.4 KB Created: 2021-03-23 15:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8e51930856188dd284d48a57aed5825b SHA-1: 914653a2f735aa435a20275f80cf37aba6b50956 SHA-256: e8d992ea38cc53ddcecb7f67624cca6d21f03a314f92904b1c33476c1c9c75df
244 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable hosting, and at least one URL is identified as a malicious redirector. This indicates a link farm designed to direct users to malicious sites, likely for phishing or to download further payloads. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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/strik?utm_term=how+to+tell+the+difference+between+classical+and+acoustic+guitar In PDF document text
    • http://microbladingeyebrowsdallastx.com/cabin_pressure_control_systemumjg2.pdfIn PDF document text
    • http://olivamebel.com/pdf_converter_mac_app_storeja8qw.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/1e88affc-8089-4dc6-8a8d-1772fb36e5a1/medusanowubus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65eb261e-2e9f-44ff-bf2c-314c7b76af8a/what_is_data_mining_in_banking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd38b4e-100c-4b04-9ef9-efebcb1e9793/17011082654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/025a8db2-8ddf-4c17-85e6-c72c3fa3608e/rhetorical_analysis_essay_grading_rubric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e274a840-99ad-4678-bea8-de124b730aa0/51839681989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2adaf17-f7f1-4623-96d8-78c7f67edac3/how_much_do_homicide_detectives_get_paid_in_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b5ad0b1-3909-4f6e-86ac-8fe9cfa6111f/13979278156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/676d3a1e-b745-4fc4-8be9-6f13c49bc732/metevipajatedatazema.pdfIn PDF document text
    • https://154530d8-637b-49d0-b90a-43bf07a176fb.filesusr.com/ugd/59359a_24b6c79804cf4705813bb1bc64e447f4.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_ed05f9607ff047d589c2be0d1f7c7ee4.pdf?index=trueIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_5079b958acc64b77916ff9bd053b9c33.pdf?index=trueIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_e670cefd69b14527a950305598a3d707.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_da9462362262463ea1a3a68b59fa4ce7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6eb3584-91ee-495b-974e-48a8da0c66b0/which_country_tropic_of_cancer_pass.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_9ddd003055d34f2393985769aef2eba9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e819d3a-d75c-4760-8f62-32a96fd0d622/24574757551.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_2a7de5fdb66b44e989297431fd263e48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8b1763-67df-4fbd-9198-75a438a11a51/how_to_create_a_drop_down_list_in_excel_2013_with_colors.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_79606a41e6da4f32bee682954ae19f34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae76931-9de3-4559-9abf-4523ba895c1a/46775528132.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_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 5476 bytes
SHA-256: 6fb4d34ece75691a5e9909b5a2d4f62d022e578233ec5bb39a684a49b253ef20
font_01_sfnt_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 10844 bytes
SHA-256: d2923881a79a257e4092be2005cc59d0e42c1b9f75b09670c0438148828e71d5