Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cd4e7d994c5907…

MALICIOUS

PDF

78.7 KB Created: 2021-05-24 06:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fb97eeec3769dd3336be37ad138f9456 SHA-1: 1f903c8971aacdd5e03228113f220becaf952378 SHA-256: 18cd4e7d994c5907f1f6921746f3af0f4e4b1dbb640e62fe94e9be19c8a3772e
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 0.9996

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 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://seumenha.ru/strik?utm_term=how+to+fit+halfords+roof+bike+rack PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5fee9a99d056f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454047/normal_5ff47a70848f0.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/8025393.pdfIn PDF document text
    • https://xafadefuvabajil.weebly.com/uploads/1/3/0/7/130776308/3099390.pdfIn PDF document text
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/dibuvezi-suvekevaruj-xovebolebesefob-patepadoxil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443356/normal_6068c2d38a7dd.pdfIn PDF document text
    • https://zugipevewepa.weebly.com/uploads/1/3/1/4/131483317/6352491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_603c50551958d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_60132a6021d77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_6026c8667b475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464707/normal_60286b23a32f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_604f64b5351ce.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/371aba0d-2f68-426c-a239-b8e570dacddb/introduction_to_stata.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/characteristics_of_information_system_project_management.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/alteryx_certification_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db10f2e4-47c5-44a8-96ba-27db69370440/63752079990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c7baff-cb5b-4d45-8738-41239da9dd64/second_conditional_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/nopozesevaxoxaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce4346d-35d8-4be2-8225-4023449b66b4/husqvarna_128ld_weed_eater_gas_oil_ratio.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/bekadamodutomu.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/google_sheet_api_login.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_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 5364 bytes
SHA-256: 1f8d5afe08fccbce85cb02e0983c347f91b5085e13df1a2a9315729fdd0bf3d5
font_01_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 10452 bytes
SHA-256: ef127dfbd5211a8cdea7bc7058977e35b6afdbcbec7cb9b2f2f418865a781b9c

Open this report in the interactive analyzer, or submit your own file for analysis.