Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff99d3d2d1409d75…

MALICIOUS

PDF

76.5 KB Created: 2021-10-03 05:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a995b11a4f5daf126fc038d700e0ebf SHA-1: 722a0f3c868274ea8235d7b5625475d9035389dc SHA-256: ff99d3d2d1409d752a28877ed4559ccb3c7509d8234c55da9fc186791c6031a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically noted as an external URI likely used for redirection. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination, further supporting a malicious intent to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://crysiq.ru/uplcv?utm_term=highest+damage+multitool+nms PDF link annotation
    • http://simonkuehner.de/gfx/userfiles/files/87805149283.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/89901292170.pdfIn PDF document text
    • http://consade.com/userfiles/file/ribek.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/luzobegubo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613839706cfdd---4805746260.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/vumenomumiwez.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/xasaxonigojojuzagejud.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/jonenibapusawovusenekixez.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/56177180848.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/tibadawa.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/74442953019.pdfIn PDF document text
    • http://belst.by/upload/file/xuvazeforivemubumakov.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/65545862589.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210906160002242.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/17965252765.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-10-1/20211001095418338119.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/86847024133.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/14831279842.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/44626562235.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/45066791906.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/zerezupukos.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/1879731926.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/busaviguviwogalixuvepema.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161582e3537f44---wazaritolafebope.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/musiwosotobim.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_off0000c012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC012 10688 bytes
SHA-256: e7bb37455dd6e77c4eac511ae8f7ad8b2be6d44accd28498884f686375da0bfb
font_01_sfnt_off0000d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 19864 bytes
SHA-256: 2b9c1b4a2945598ad58cb3876dcffa7ae61f2057862f0e8e67bee13b150c47f0

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