Malicious PDF — malware analysis report

Static analysis result for SHA-256 803f5451cd0fe1f7…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 01:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 86dc87e74fbd6b9a49d58f697bef1672 SHA-1: 1f2cdf821ad8d80a4196793bf7258c21c2baaee6 SHA-256: 803f5451cd0fe1f7a6f9f1263f97aa6c5ef2193c7537cd5832ecda642574caae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to external domains, many of which appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of these external links and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://pistant.ru/uplcv?utm_term=pes+apk+2019 PDF link annotation
    • https://lifesmart.ro/ckfinder/userfiles/files/gelurox.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/24960378727.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/gunevavisoj.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/dezibigapotukugaposumukos.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/kibaw.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/vewosebidizonijabosugabu.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/11830350812.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/13083088747.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/bakosekawobakenogoroliven.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/61239011419.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/fufufubazor.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/74938449179.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/53202530447.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/xeposebix.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/59323269450.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/11040159133.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614664ed0b895---teroxumiwoxexarojizikuv.pdfIn PDF document text
    • http://momsystem.ru/public/file/68953815660.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/62599858442.pdfIn PDF document text
    • http://bamila.vn/luutru/files/63211138594.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/28852798455.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/kifim.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/fidaguzebobibofexebakoke.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FE 19620 bytes
SHA-256: 903f7192c83d0336eb43322fe3e29cdcfd3128cecfcbe3b54587801266d9e7ed
font_01_sfnt_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 16240 bytes
SHA-256: c66f5000faed40fa475f88832a736b1ac64b02a5e2aa6e6c6d6d48c3758de8bd
font_03_sfnt_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 10240 bytes
SHA-256: 8ae3ad04ce1caa63a33167dae7b5cad29b7ffae5acd2578c6db60d579e884ac4

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