Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a82507189ef9135…

MALICIOUS

PDF

76.9 KB Created: 2021-04-28 16:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7d8a0d2ef10295c64739da2b63d55fc4 SHA-1: 55c2d86d90098e90fc0a238c446c8d9809f1f84e SHA-256: 6a82507189ef91350cdbc79f46e1899c8a42c6ba4ea8e8febb33c6e6fb393585
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

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 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://gimoguvi.ru/strik?utm_term=beats+studio3+wireless+skyline+edition+midnight+black PDF link annotation
    • https://cdn.sqhk.co/losomilodip/2JhhZfe/37756917775.pdfIn PDF document text
    • http://brandframeb.com/quarterly_payroll_taxes_form_941d64mg.pdfIn PDF document text
    • http://idealicaitalia-official.site/rexomijifarulopewohden.pdfIn PDF document text
    • http://sellforce.ru/fist_of_fury_bruce_lee_movie4sjvp.pdfIn PDF document text
    • http://springtea.space/50849815256q6av1.pdfIn PDF document text
    • http://vedice.ru/dagogunamomexivwklt.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/ahfgih2/cinemark_peru_trujillo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vexeliku/cease_and_desist_letter_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691960d7-b87c-41aa-807f-9696e0682f61/49131988224.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/cultivo_del_arroz_en_ecuador.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d975e22e-d697-4b27-b9f2-2d64a2148272/sagosisobujosafimazod.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/feribosomuzerorili.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/jopurolov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91595b81-b995-48ee-9fda-fdec7288cb5b/free_online_merit_badge_classes_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003343dc-c6f6-45ab-b8d7-6b1844b7eefe/62729825846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f95155-49d6-4f7d-8636-ca55776f9d53/by_the_waters_of_babylon_short_story.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_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 5964 bytes
SHA-256: 30a8977d31e5f77050a099a192c5ccfc3dbbcc8c7877b9171854db468005e2cb
font_01_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 10752 bytes
SHA-256: 0e710cc4bb9eb053e6a198ed3679f619467cdc5db23ca83d88c1ffdefc4afb04

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