Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61f78cbb9ebaef2…

MALICIOUS

PDF

66.3 KB Created: 2020-12-03 14:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 28317f3d3a3747e5843984aa1bfaf289 SHA-1: 9bf97a4fbb911d8181393716937bd3a08926f05e SHA-256: d61f78cbb9ebaef2ffca81243a471085422f9fec99dfea8d39dcd67db837b15e
236 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF document contains multiple lures, including impersonating cloud documents and prompting the user to install browser extensions or updates. It also includes a large number of external links, some of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://trafftec.ru/123?utm_term=boondocks+full+episodes+google+drive PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485442/normal_5fbe2a27b94e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_5f920bbbc39ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473432/normal_5faec55459c51.pdfIn PDF document text
    • https://vosaxoro.weebly.com/uploads/1/3/4/4/134469305/pumikerese_puwigujafajig_kekepazupolemo_xodemuvabep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444370/normal_5fa72ac024d04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488555/normal_5fb3760c13c1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_5fa0777a39620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486215/normal_5fc531f39c90f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf48bee6d49a06bb87db25/1606371518998/11446504036.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/sunrise_middle_school_kearney_ne.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/fudenitapikofibumib.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_off0000c885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 5288 bytes
SHA-256: eb016dac51257c7260cd20cd7ffb835436b2d98b8e21323996f629ec49be5b29
font_01_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 10004 bytes
SHA-256: 3284261ccc41607d47cb88fdc7543bc928371702bae0518694447b9bbc3c805b

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