Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a9cfb23ee787f6…

MALICIOUS

PDF

73.4 KB Created: 2021-09-24 04:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eee975863733c0df45f1210cd3147e34 SHA-1: c382dbdf9e6685d8371cbe6399c4746f5361be2f SHA-256: f6a9cfb23ee787f6e7e1de178af95936f4f43905d454ac1e4c892dc5530b878e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or scam attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The presence of external URIs suggests an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3653

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://laborke.ru/uplcv?utm_term=download+norwegian+wood+pdf PDF link annotation
    • https://netpage.info/userfiles/file/remevedexupogafefuwog.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/guson.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/gozebazusivin.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/bokuvexefanemosaba.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/senazapekokubelotixoso.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/raramolidisegilosofa.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7ca494a4---fijopa.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/bimaz.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613145ba4975c---gukokepirugedemu.pdfIn PDF document text
    • https://spacio.hk/attachment/file/24711927805.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/16906893583.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/jaronepoj.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/jabalewetaveb.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/remidobewuvotulezibek.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/tewuraz.pdfIn PDF document text
    • https://digireg.cz/upload/pezejefudofivuvuma.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/dorusiwisol.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/wodogun.pdfIn PDF document text
    • http://bndweb.nl/upload/files/21364430024.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/lomijevivutujatisenagom.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202198210416988.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/84685927774.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/37593346186.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/30519753471.pdfIn 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_off0000c066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC066 19216 bytes
SHA-256: 4385875cdf914e00609a8bedd7d043827d0aca6b73855e5f8a3381ab29065fab
font_01_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 10492 bytes
SHA-256: fa47c536d0b02a9ce8c3aa087409394f91c4110aceb0f82c740d6c9dbbfdaa59

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