Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b04dd88b49053e3…

MALICIOUS

PDF

72.7 KB Created: 2020-11-24 03:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 123b26af730db29519cafab661813ae2 SHA-1: 247829c29c93bd070e252690913a14d6210500fe SHA-256: 4b04dd88b49053e3d2f209234d37189400797895bc357ccfe2ce9d908f81dba6
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffking.ru/aws?utm_term=how+to+solve+asymmetric+information+problem PDF link annotation
    • https://tejovobomogopiz.weebly.com/uploads/1/3/4/6/134626725/kidukono.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/389ac582348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/gufedoviti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a71bc8d-63ce-4618-9c3d-215644ee3adb/fisotazofegujumu.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/watch_live_action_aladdin_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed322f1-7cf3-46aa-bc2c-13ea4c3d927f/mepipipudukowapibida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b5ed28e-5033-477c-a48d-e5feea7bf240/43927749796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0b0a122-b910-413f-b92b-78a1708ca939/wosujerapisukenalapofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cafd7fc-7b19-4ba8-b9ab-5d4670cd1f90/brother_mfc-j480dw_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/8623128667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c39c7a7-f070-48af-833a-314013f126fe/a_christmas_bow.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_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 5516 bytes
SHA-256: f1097b0c01bd895782257a4812ade521e5bbab803f3658a9a172c64f5e5be089
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 10256 bytes
SHA-256: d05c013373d1165ae9c432eafb8a5fef6e36dd355077ec9d72258e25dd5f94c0