Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19d9444756e8f0f…

MALICIOUS

PDF

72.2 KB Created: 2020-12-13 21:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 304ff3116a7b7682c308984debdd313f SHA-1: d1cd2bd6e11d3caeab14faf93c866ebe507d752b SHA-256: b19d9444756e8f0f5a7a91bb5f88879eab8a26de8b4656aad195b6a5d0968571
216 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. It uses brand-impersonation credential phishing. 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/3633516.pdf.
  • 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://traffset.ru/strik?utm_term=singer+tiny+serger+ebay PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5fd2bfaabc36a.pdfIn PDF document text
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/3633516.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/vuriso-sariset-vozob.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/4d87de01-2194-4b4c-bfb2-e0ea5def29d9/20569958805.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc71daa791da6493f68ab84/t/5fd164c88185f4776a0006a1/1607558345415/39251423459.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6ba413-4905-4933-9bde-281a45dbaa6a/damovutuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a61d1f8-982c-4a32-b2ca-c6ef517a90b1/disappearing_four_patch_with_a_twist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e29c6f7-42ce-40e6-a507-9c51359d8ec8/gevopuwejipenebinijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a990d4-d6e3-4386-bbae-d3fef7e0f107/aklda_kalc_salk_program_isimle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5b2edc-4890-4841-8fb6-4837b4251948/25557626973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7476410-64b3-4a12-9fa0-58a95898abe0/9455590381.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1162b68612547ed5f39f0/t/5fc5a6764e98326c02d41d5a/1606788730093/82026916418.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5f4e3485235c86bdf3d3/1606377297197/valumomubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0df7ab-dc9b-4611-a6ce-a473eacb02b3/32004978439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7240823d-4566-4f46-afa4-0d3b825b975b/10596388243.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_off0000dd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9B 5168 bytes
SHA-256: 701794851be14a09abad3410fa47276ed26af9bec74dfef0452cecd2827feaba
font_01_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 10864 bytes
SHA-256: 4806ff7eeb5983872a9d0e66ed2bd5f8aae6d15898ebb59c35b7e12a4010daa9

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