Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30e28a50923424b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 07:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61cad9b9d18f25e28bf75da13c0764a8 SHA-1: c898c5e2dc96aacdcbcb967701bbaa2316756ed3 SHA-256: e30e28a50923424b3bd3b8d15b16a6afd857cc109d4eea75ea80c988ac32edca
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a likely attempt to redirect users to malicious sites. The ML classifier strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or redirection attack, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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://inwebjor.ru/uplcv?utm_term=alan+turing+computing+machinery+and+intelligence+pdf PDF link annotation
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/bilefatorid.pdfIn PDF document text
    • http://kmjjt.com/uploadfiles/file/232256154053.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/meruvopiredevupa.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/39006871965.pdfIn PDF document text
    • https://kermanrooz.com/img/files/xilewenodal.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/55097483304.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/92152186956.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/26375987829.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/kokepatubiwolu.pdfIn PDF document text
    • http://ossokahve.com/upload/file/xajomuwemamofexapowaruk.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c1267097---wobazo.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/latusobogov.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/24680876788.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/fudupobewuzuxilonilar.pdfIn PDF document text
    • http://garderoba.sk/images/_file/41809658757.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/71797762087.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/legirutewabalafemetiwodu.pdfIn PDF document text
    • http://rentaruedas.com/files/others/xetaguwapepega.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/kokul.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/40016043892.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/67378689650.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/25860071590.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/67511344454.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/nutopuwodanuweduxabi.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_off0000b025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB025 11096 bytes
SHA-256: caf6a478879f6236203b316a3613107b7ba48d709a85168b1fe68d3447910fc0
font_01_sfnt_off0000c9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 14596 bytes
SHA-256: dffd242c61c636fb0c8c9b6fca24be7d701d852d93e64eefc11b7124c8db81b5
font_02_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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