Malicious PDF — malware analysis report

Static analysis result for SHA-256 25901d0006c2027c…

MALICIOUS

PDF

44.8 KB Created: 2020-11-01 05:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4a5f00ecdfa64a8a81216c14816e8bb4 SHA-1: b6c7c88ac294ddc159a0fb724bf0b907a1cd681b SHA-256: 25901d0006c2027c6f5f80a1a5fe102351370d59bd5ab1804e99be4778a98db2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains numerous embedded URLs, many of which are part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. These elements suggest the primary purpose is to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/strik?keyword=deep+learning+with+python+fran%25C3%25A7ois+chollet+2nd+edition In PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/sosuzukegejuxipom.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/d864c433-b6a9-4480-ba91-8a409029a558/nitowejonaxufipimonovod.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/kotorajaxudemidifad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa60082-5edd-45ab-96e1-c31495699231/46947260637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd49d5e-90f7-48d0-8863-ad1218493ca5/rowe_middle_school_chicago.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4214/6984/files/somatic_nervous_system_and_the_autonomic_nervous_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaab3c72-5d2e-45ea-bb9c-d77f7d1c421c/ee_keeper_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/time_table_for_fifa_world_cup_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/pdf_to_word_converter_software_download_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/barriers_of_entrepreneurship_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dde9339-892d-40ab-835f-4c5a02d2a483/xazijatupoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb3daaf-bcfd-4e66-ab9a-6ccd7a301f13/73296575597.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_off00006887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6887 5924 bytes
SHA-256: 44c095734d3f070f570ba6d75812da1485997f1c8271578781cf51aa8f4e40a1
font_01_sfnt_off00007c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8A 11640 bytes
SHA-256: 9869b384cb200f1f4700cd798e6f69d20e45cb55dce2cac14812da4e7ca09cd2