Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3e33b112386c88…

MALICIOUS

PDF

65.1 KB Created: 2021-09-29 08:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c6efa255111e5bc8700ea18fd95ca42b SHA-1: dfcee5c13180f0e0cc74a46349c66caeeeb45a00 SHA-256: 9f3e33b112386c88a72f55cac57817f15c6cbde8da963438d9d7cd47ff8ca2a7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous external URIs pointing to various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple unknown-reputation URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3405

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
  • 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://catamma.ru/uplcv?utm_term=my+hero+academia+online+free+dub PDF link annotation
    • http://imoroz.by/upload/file/10946855675.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146896467c95---55821704056.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/21550880569.pdfIn PDF document text
    • http://leeandrewdavison.com/download/11818528991.pdfIn PDF document text
    • http://belovosushi.ru/files/fetijiloposex.pdfIn PDF document text
    • https://tdfstore.it/file/60287157999.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/30269593545.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/29836628780.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/tedetabopewumilosizup.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/sonuka.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16153f41b7a8d6---41522081712.pdfIn PDF document text
    • http://strandedtattoo.com/file/sarozuwuraso.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/30008548635.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/xudovizoj.pdfIn PDF document text
    • http://computerdoki.hu/user/file/zurovixuko.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/tilunimusof.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/46556350266.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/24921977322.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/daxunal.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/pipunuxoninaviruxixowojev.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/25488391310.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/suvadip.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/13832659694.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/66822242982.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_off0000aed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED0 10824 bytes
SHA-256: 1b954f871cb2cff9c2bdc156438e79cbf4b46fe49e25ab1aa2eebbd9562f7e33
font_01_sfnt_off0000c78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 14732 bytes
SHA-256: 8b87df32d5b4e2d438a024b7481e073e0bdcdafc717f4a8a66d1c9590e352e3d

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