Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8b8bd9e67ab6a5…

MALICIOUS

PDF

39.4 KB Created: 2020-11-08 12:00:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 62c91e5b40188c6a74be0e27fa34114a SHA-1: 525aa529a9f45b579fe11725c8e9d4913f017eb2 SHA-256: 0c8b8bd9e67ab6a5d4c7607597c0854865541c6f58207b1fccab97d1bf40007d
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs hosted on S3 buckets and Weebly. The heuristic 'PDF_SEO_LINK_FARM' indicates this is likely an attempt at SEO manipulation or a link farm. One of the embedded links, 'https://traffnew.ru/aws?keyword=cedar+hills+hoa+utah', is flagged as potentially malicious, suggesting a possible phishing or malware distribution vector. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of links, which can be used to redirect users to malicious sites.

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://traffnew.ru/aws?keyword=cedar+hills+hoa+utah PDF link annotation
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/4011239.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/bagisi/21427395050.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/balancing_act_practice_worksheet_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/wow_defeat_grixis_tinypop.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/unblocked_games_gg_ez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a2ee15-68fb-4bef-b5ba-a804bdd4131a/nelotijigajusegugijuremeg.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/modern_welding_11th_edition_answers.pdfIn PDF document text
    • https://zolirukefo.files.wordpress.com/2020/11/37136828462.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/93667365695.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/apache_web_server_performance_tuning.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/butternut_antenna_hf9v_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/30968169652.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/kujum.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_off00005b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B02 4816 bytes
SHA-256: 803812a4a74dc75b374d07ee0e7df6e05500ec01c895a43d15f918167f3d6ffb
font_01_sfnt_off00006b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B50 11312 bytes
SHA-256: 7a643218d26c0107f6899f592cf500ba99c775164479aa32b0ea336d1d7bcd88

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