Malicious PDF — malware analysis report

Static analysis result for SHA-256 02da810b30c18ac4…

MALICIOUS

PDF

74.0 KB Created: 2021-02-23 23:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ea1b1152dc8c0425a6ed16a6810fe469 SHA-1: e473b527e8cf90b4221fcbefe4f5f143746aaa53 SHA-256: 02da810b30c18ac487957ff70bb28dc3a645ed6ee6f5ddc79d86bf7b327c7295
96 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, with one pointing to 'jacksth.ru' which is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a link farm or redirection mechanism. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=can+you+cook+fish+fingers+in+a+george+foreman+grill PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369152/normal_5fc835fb7dc96.pdfIn PDF document text
    • https://wivaralizufijol.weebly.com/uploads/1/3/1/4/131483386/3d9ec0656.pdfIn PDF document text
    • http://edalovert.xyz/484822415645143g.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/pewutatisazuzodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_60265c31e60d8.pdfIn PDF document text
    • https://dikejupovavobu.weebly.com/uploads/1/3/1/0/131069859/tefukezu-gerefuduti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_60123de296d68.pdfIn PDF document text
    • https://lepamatizetu.weebly.com/uploads/1/3/0/7/130739269/77881ee0c6ea.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/safago/serogob.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/80874401807.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/reason_for_leaving_job_form.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/diabetes_mellitus_treatment_guidelines_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/xender_apk_old_version_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/kartilya_ng_katipunan_book.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/cape_cod_canal_fishing_report_august_2018.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_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 5368 bytes
SHA-256: 49ad6778d88383e492d178f954e07a4a8feaf7088378f4030753f6cf74d1a920
font_01_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 10516 bytes
SHA-256: d6400e24705acef5f6c31cd7188fbedc9d610d377989f3d3523d45044cbec350

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