Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1db0cc8cfcf04d7…

MALICIOUS

PDF

45.8 KB Created: 2020-11-07 23:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 05bf6831ed8bb0ff704f88843d4f8bcb SHA-1: 98b4ec70eec0bf21b8f7963ecf636262f53c97f3 SHA-256: c1db0cc8cfcf04d74ad3819d5ae42b667b611daac57f84fc60d4faee575cc6a7
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?keyword=tetris+friends+unblocked PDF link annotation
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/bodejakoga-nawokogone-dunekitom.pdfIn PDF document text
    • https://zuzolavilasobin.weebly.com/uploads/1/3/4/5/134523903/100925392d009b0.pdfIn PDF document text
    • https://minikugonon.weebly.com/uploads/1/3/4/5/134500064/munelanozopape.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/974771.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/lexibefe.pdfIn PDF document text
    • https://gekilatati.weebly.com/uploads/1/3/4/3/134378061/sogoxuwarenoked-rowenerajilo-wibezosapujag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a9ef7d4-f8ab-4b52-a554-10f6ed093b4f/jozuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82160b6e-f6ea-4a5c-a8e3-d7e226ba92a5/88701394020.pdfIn PDF document text
    • https://dilopipo.files.wordpress.com/2020/11/demetivudaxakoleze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9dd08c-dcc0-4977-b922-f3c77dade384/two_way_tables_worksheet_year_7.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.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_off00007446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7446 4960 bytes
SHA-256: ddd34d69c1dd0c0bdc6bfc2df833101f560e33f4f1f078741575b485dff65882
font_01_sfnt_off00008538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8538 11320 bytes
SHA-256: 11098e58cd3687458acf09ddde78ee7a5a139cbcb17af302e5d82beb8194e6f2

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