Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d05a904e3e0dce…

MALICIOUS

PDF

79.1 KB Created: 2021-03-26 09:38:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9b79f527908cdf408da1a62829bf5bcb SHA-1: e73027a2fa660a66a2cbd61911845e27c6003498 SHA-256: 50d05a904e3e0dce449324b24bb2da6aa5639cd73c74f7788c0915ae57b035bb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://dugedepap.ru/wix?keyword=star+wars+pinball+7+apk+cracked PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406456/normal_6000ec7e5c836.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/g5yYsgi/ear_doctor_bay_ridge_brooklyn.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/f9UNzhj/58423655845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501791/normal_602d62ce4cfeb.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/b67qkQR/short_love_story_books_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/revipidamog/dWqhihi/business_english_vocabulary_builder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_602646ca88383.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_0085b408bf45484cb34d7fca43f540b9.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_8e26efc85ee141a4a8b77a5eda1b5fde.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/589a3d98-fdc4-4a1e-9f01-251261e81b57/55933572728.pdfIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_160323f21b414944afa806d7b663ab08.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_ac1c0528fb5d444ca0061e255b1cadab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0cfe49-d813-4183-8cb7-20c1bca2712c/bosch_refrigerator_parts_list.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_f88d2eb1e59e45ff87a27442617b50cd.pdf?index=trueIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_124609dbd2e04950b5afd6f373eeb9c8.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_4ce6d51bb8b44bbea0fa10b8da6f5681.pdf?index=trueIn PDF document text
    • http://sofidusujewa.epizy.com/migaki.pdfIn PDF document text
    • http://nogomazarem.epizy.com/exception_report_definition_in_computer.pdfIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_27f9e7290e834a4d9eebb68686a9233f.pdf?index=trueIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_6e468542579f456694cfa2c5da44b33f.pdf?index=trueIn 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_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 5544 bytes
SHA-256: 5ef23666628691fd16172d230e32ab554c3d50e2db603beb6ac31bbf977d3fdb
font_01_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 14224 bytes
SHA-256: fce074eb7ee1c6e9ea761b43033a54b3e88adbc488dc7fc0bcc0f4a8934fcfd9