Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7191868a481df5…

MALICIOUS

PDF

74.8 KB Created: 2021-09-10 16:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea57e5cea99be2d1ff4ffc328cfef8bf SHA-1: 1f6fe709ac774055ae053dd980f08b8f2be1a849 SHA-256: 3c7191868a481df57be366c6b46df1e507b02d087463fe23150b11389099bc50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or redirection scheme designed to lead users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6946

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://inwestorfinanse.pl/userfiles/file/lozovonigugifadatosom.pdf In PDF document text
    • http://theurbanbazzaar.com/userfiles/file/gonegobilekajinivizo.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/vofilavixoliludupepa.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/36246334226.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/nujenisaxo.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ddb01044d61c842900ec86bad1b66d69/dudojo.pdfIn PDF document text
    • http://sgpeo.pl/users/file/65257667843.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/41961042896.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/59244370439.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109061506517393.pdfIn PDF document text
    • http://alkanboya.com/files/file///25045024482.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/3624178048.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/87557646191.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e651395aa---redutulagapugeg.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/nedupojeritufexom.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/bejurosisefiwu.pdfIn PDF document text
    • http://baove24h.info/upload/files/kogapifomo.pdfIn PDF document text
    • http://mosjob.ru/images/file/mezeposigikedetedewum.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/mobotewonegima.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/riritavofirorozijewepe.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/bisegegakodiregufubuxigoz.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/90457779743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=showtime+mortal+kombatPDF link annotation
    • 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_off0000cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 10492 bytes
SHA-256: c5e83f4312db096f8d68242094022f854cc55e41b4917d0a304de6a20ad99982
font_01_sfnt_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 18304 bytes
SHA-256: ae7301b76b6829e38b4dc28a4a66b8f264695cfb041c11800b191fad61260a0b
font_02_sfnt_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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