Malicious PDF — malware analysis report

Static analysis result for SHA-256 967c3a97919891a7…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 23:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01919e462968fb9f1fec2c08b71c4d00 SHA-1: a1923cab76f5b2ece4d63b48a70e92ea60180692 SHA-256: 967c3a97919891a7cec9814b4ef8c0b2ef8daf2af80894cc19d79c001c0c662a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=antecedentes+historicos+de+la+geometria+analitica+pdf PDF link annotation
    • http://boissee.fr/userfiles/file/juwubewage.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/bizuguxakuvoxavid.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/tasabalilu.pdfIn PDF document text
    • http://abc-tel.ru/data/File/xodobevuku.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/kisuzefujo.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///minalorudet.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/31888112173.pdfIn PDF document text
    • https://alpinashop.bg/files/76974916095.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/6292369396.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/somaveta.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210915_836629BD3CECE42D.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/wufolikazogesid.pdfIn PDF document text
    • https://alutat.com/data/file/nemubolaleka.pdfIn PDF document text
    • https://sinarwaja.com/account/files/xumupapepegatipugelojuro.pdfIn PDF document text
    • http://cahayamimpi1.com/contents/files/75500528694.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/69921677164.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/45917152671.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/zolofovovife.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/91810319671.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/levuxolexulugo.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/22240606199.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/wowumosek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 18836 bytes
SHA-256: 4da4847f11d9d73b75212216bba038f85f2edef5efea9e6b3f1c4b5f5966404f
font_01_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 11048 bytes
SHA-256: c4f43387a1d970600fe6c233afe813edbc83b047141ac9b65adaa15b4353043e
font_02_sfnt_off00012efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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