Malicious PDF — malware analysis report

Static analysis result for SHA-256 4129c1243c6cf6e1…

MALICIOUS

PDF

42.6 KB Created: 2020-11-08 14:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f7f9ef2bff3fa2108630258e35b04171 SHA-1: 28074c0cd7f6914185b2b2af7292fe296f0a658a SHA-256: 4129c1243c6cf6e1ab5977eba868bfdbd3b29208a01908e4bfebaf83021b1445
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 1.0000

Heuristics 4

  • 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://traffset.ru/123?keyword=waltham+youth+baseball PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/votawawo/wixene.pdfIn PDF document text
    • https://wefufepolo.files.wordpress.com/2020/11/pathfinder_rpg_torrent.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/dirametoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ace7b0dc-9137-4772-9d41-3c22232a6c6f/ocean_life_zones_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b558203c-60b3-4f39-a288-f411ba3905ae/jujeloxevam.pdfIn PDF document text
    • https://dawaratuni.files.wordpress.com/2020/11/ledagaxixus.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/7th_grade_additive_inverse_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/vibivakiz.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/gunuwijaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a8b8bce-c537-431f-ae86-fdbbf9170a85/sowiwigov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f2c38d-8c90-4da5-a914-5242d948f22a/josakewuf.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c71945-d83f-421c-8dba-41d4595075cb/gewulepesevu.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_off00006734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6734 5084 bytes
SHA-256: f822f47f2985a7c3bd242243ddb13bbb8578d1d206eedff7708232307d542769
font_01_sfnt_off00007868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7868 11108 bytes
SHA-256: ec2c789070d5236004d4204a0e572878e04330e96ea02c7f84e483e76a1dd76d