Malicious PDF — malware analysis report

Static analysis result for SHA-256 584a927887d2c07e…

MALICIOUS

PDF

80.8 KB Created: 2020-11-17 00:50:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 528f7fbf0f7e720accd36425bf590cbf SHA-1: 10873368398b25dc71f28769e2bcb3997087f02c SHA-256: 584a927887d2c07e089a922905e2baa0bcdbd71e4830d7614475446d3c24c3c7
156 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 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 0.9997

Heuristics 5

  • 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.
  • 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://traffking.ru/123?utm_term=japanese+bally%2527s+las+vegas+restaurants PDF link annotation
    • https://vupubajuxik.weebly.com/uploads/1/3/4/4/134492473/wegitudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_5f9b1989535d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f8c79a52b1b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5faffa643b7e6.pdfIn PDF document text
    • https://xoselobukakuri.weebly.com/uploads/1/3/4/4/134498653/mugavafusemurobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f8a9c91c961f.pdfIn PDF document text
    • https://gowiwoniba.weebly.com/uploads/1/3/1/8/131857243/1865409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5f8f40bc69b66.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/ab13a327-6e82-43fe-b847-59e1724de621/5121234079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4d0ca4-f8c2-43bf-88a4-6f3290289bcc/paint_night_flyer_template_blank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cd0c9ba-c07d-478b-b0d0-7bc38f8642ee/76832734260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1295892-3908-4644-9972-40c263308850/88477594285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c31c8c5-25c4-4679-a3e5-f9af4f22a9b3/solutions_manual_for_a_first_course_in_database_systems_3_e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85f20fbd-6a8d-4656-9430-7b2a21b49f60/89526481641.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_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 5312 bytes
SHA-256: 05344fee00295c91cc514bfb445132816c74c896b19bb9510d2582aaf1a83251
font_01_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 11636 bytes
SHA-256: d5c325a4e96cd08f7e437bed6d69208ab2507bc45b38ecfc14deed0b54e1ba9e

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