Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6c6cadc6474d99…

MALICIOUS

PDF

69.8 KB Created: 2020-11-18 06:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d8bf954ab42b211cfb84b48595318422 SHA-1: 226b4ccf35f9d805ade0d089d10f8580a975d8b5 SHA-256: ff6c6cadc6474d9980c8ad46b6491ab5486d93ca31cb237f5d78e598796293e6
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-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.
  • 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://dusexitope.weebly.com/uploads/1/3/4/6/134646398/9944119.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=digital+products+download+wordpress PDF link annotation
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/9944119.pdfIn PDF document text
    • https://domamulobam.weebly.com/uploads/1/3/4/5/134527142/bovipefedipav.pdfIn PDF document text
    • https://lorovojiwu.weebly.com/uploads/1/3/4/3/134318747/suwobatozetisuv.pdfIn PDF document text
    • https://mekuxiwefajup.weebly.com/uploads/1/3/0/7/130739023/junovatupasutekusu.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/4625200.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/7010b5a8-84d8-4536-a6a3-be03992bdeb7/si_beagle_retiree_programs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e8a9be-651d-42ee-9fc3-15bb384a5a3d/dawikivufinibulifujadagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaaaf3be-bb07-4e23-b01c-25c255ee0688/83186718921.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/duane_michals_biography.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/air_pollution_measurement.pdfIn PDF document text
    • https://s3.amazonaws.com/lanowilovuviwib/34137732168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d074a6d2-44e6-49cf-8bcd-7bab951d55ca/51592798999.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_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 5332 bytes
SHA-256: 600ea6fab12adaae1c4048d31017f17714d9a7cebdd97c4b4f0bee496ecdb0d3
font_01_sfnt_off0000e2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 12240 bytes
SHA-256: 115f41c9e7a8a84b4d282d6b77c3a918a24f00a10e30790ec9066acea18bfbe0

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