Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a55163e7fd05564…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 13:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4d5239e32c18f0a43d4a3adf6171402 SHA-1: eddf556420c36a2ad8e4b86a4b4bbea95fd5f9cb SHA-256: 8a55163e7fd055645b0ad8d12819471b8ff38affa6cc25815aa071490044ef3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as https://drafthe.ru/uplcv?utm_term=after+we+fell+pdf+book, likely lead to phishing sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to trick users into visiting malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=after+we+fell+pdf+book PDF link annotation
    • https://landbondcorten.com/attachment/file/a6c4de349b941248fd1ba6ac6b97a3cd.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/8439948240.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/levalikesutiwenozu.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/81042485269.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/63717100151.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/65324256013.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/wovam.pdfIn PDF document text
    • http://www.bash.cl/media/file/buzovipulitifufipusezisi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b57a49fcc4---lovadirejazurerukafoz.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1dfca0da0---52672054797.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/vezilozosidominasutuwem.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_D500DDED0ED394EC.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/zisimomowiza.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/84106201390.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/giwejuretarara.pdfIn PDF document text
    • https://salwangurugram.com/files/busaragof.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/45377176407.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210914_0856ACF5B610E829.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/pavetavumodoraxemitu.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/77099155789.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/galilotonebolepujadebapu.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_off0000ad3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54C 16328 bytes
SHA-256: 7dc0ea0f1ee320eb590f0a4e932eef8538685a4887a7d0f0a45e11cef9848d30
font_02_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 10264 bytes
SHA-256: 5ddd502b7f12aa26ac7e40fd7a5b0d53f375c44e04027be4a47589a6464f6a35

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