Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef943f37b1997c24…

MALICIOUS

PDF

62.2 KB Created: 2020-12-09 23:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b3dc94fa821b8049a52f281cade23851 SHA-1: 386e77c79cf964f818a4a0cfba45b2b1223c25df SHA-256: ef943f37b1997c24d9f49fd8d2294aeca3a2d771c4b6ce636d4abec5c03809ab
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious intent, including a link farm and lures for fake invoices or browser extension installations. The presence of an embedded URL and the ClamAV detection strongly suggest this PDF is designed to exploit users, likely by directing them to malicious sites or initiating downloads. The ML classifier output of 0.999629 further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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?utm_term=black+sailor+moon+wig PDF link annotation
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/25101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5f9b2d35c5ba8.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/dabuwosevitumiw.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/5fc7bc0302915d4a16fa7057/t/5fd0023168e95c5e3d51a59f/1607467569402/ticketmaster_pet_shop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1f5a3c6ccf69f32764ee/1606295387746/swtor_customer_service_uk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc35e67cd1e280355e3f728/t/5fcb6c21b6b7366152f85b90/1607167013657/flash_video_downloader_chrome_extension.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd8a92bbd740658005df2/t/5fc11d64e6d49a06bbb99c95/1606491492810/yamaha_maintenance_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58cd3f75b16643cc4c28/1606375630431/advanced_funk_studies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bfed47e-f0c4-4667-a9e6-5112614fb65b/5461655553.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc14640df132613bbc04837/t/5fc2fdaaa97599144e5adfcb/1606614443293/rerowabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/344ed437-76cb-4201-b79e-cf0e5f794eb6/zivejel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2f4b20-cace-47d2-a2f8-809327dedbd2/97552605054.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_off0000b71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71B 5324 bytes
SHA-256: f32a324ec1536060d812a22ba5671b9d2f749d0af1a7dc1dd385decb1c954213
font_01_sfnt_off0000c938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC938 10352 bytes
SHA-256: b92b6aee2890ea5d075535d5ab905effd8c0dfec49bf340ee7fabac27579bfb7

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