Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b057c4ff9747303…

MALICIOUS

PDF

45.5 KB Created: 2020-11-09 11:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0e15b8e0129d0500ec3d01dadc2ef8e1 SHA-1: d1bb2d078517ac8b45aefc432ccbe986c8285892 SHA-256: 8b057c4ff9747303c84e1f7edfdf13a6d493fe4e19723dabc6ad40fae7faf66b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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://trafficel.ru/123?keyword=good+words+that+start+with+h PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f87e66197ce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5f8fdd17159c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5f9cfe751723f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5f93b2b949eff.pdfIn PDF document text
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/dezugexonopex.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/dunijojivisilezuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5fa21e6d2b154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_5f8c943e5cc1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f8ef3792c539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5f906b0b36959.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/purufiz/adjacent_angle_definition_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297c0c15-1199-4b1b-97a3-6f39be9573bf/6677_best_game.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_off000071c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71C5 5004 bytes
SHA-256: e3cf2ce72f008687cdbeec48f1e599087937612b64420895598b0b818d82babe
font_01_sfnt_off000082d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D4 12176 bytes
SHA-256: 298f978d0924dc754725b2dfc2dde077cb66e454281faa6f42145f535c59e7cf

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