Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a84839be19adc5…

MALICIOUS

PDF

89.1 KB Created: 2021-05-30 17:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ab47778ec9ba01dc25eef622c6fa0fbe SHA-1: 2a1c74d435835d9f09fd08129e88191b787b3ea9 SHA-256: b0a84839be19adc5083506c24cfd46a9ffe9e1200f0f08ee57ca6d4302be2cde
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-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.
  • 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/123?utm_term=android+10+cho+note+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411694/normal_6054817ddb3c8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460980/normal_60b1e9b41837f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393041/normal_601f4721ee1d9.pdfIn PDF document text
    • https://samalatedagunir.weebly.com/uploads/1/3/4/0/134040677/5213533.pdfIn PDF document text
    • https://nugaridepi.weebly.com/uploads/1/3/4/4/134474671/lovomaxelugebem.pdfIn PDF document text
    • https://pufujodixig.weebly.com/uploads/1/3/1/4/131438007/7525024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_6044caafb754f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4452199/normal_60b10b5483e24.pdfIn PDF document text
    • https://bibatuzasofobi.weebly.com/uploads/1/3/4/8/134879938/c41e9997bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_606c04c98199d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_601d1aeace351.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/9716f233-b9c9-463e-ae82-b22333a547f8/4525800239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24a87f8-5144-4a4a-b4f2-4439f5c4871e/73421664484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6015959-0d1b-417c-9a86-a9a82b11da61/descriptive_analysis_in_qualitative_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c0fca0-bc86-4b99-bbb8-fc8ca680a7e7/the_annotated_constitution_of_the_australian_commonwealth_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfd5c24-7b5e-47a0-bbc8-8dbd3cc59931/first_alert_carbon_monoxide_date_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e422c6-db96-4d34-9ca5-ceac558fd6da/how_to_list_disk_in_command_prompt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe7f96a-4271-47c8-8486-76bd69d57e52/crowd_release_notice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af8c732-5fc6-4457-b633-62c86634b79e/how_to_build_a_wood_table_with_metal_legs.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 4944 bytes
SHA-256: 9609cfd0cbe5650d1959b34056c5e51227cca38fe15c1436919290b739d464f5
font_01_sfnt_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 19496 bytes
SHA-256: f3e7a86d19fca557746b847bfe8c63ad71e6a4e3d2faf25c13ea018361bf79e3
font_02_sfnt_off000140f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F8 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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