Malicious PDF — malware analysis report

Static analysis result for SHA-256 048355d1476f1d48…

MALICIOUS

PDF

71.9 KB Created: 2021-10-01 20:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 17e46f571d247b3c76088fcb7b59d900 SHA-1: 9d551af405453b9e51762fff40f1fece3d695dad SHA-256: 048355d1476f1d487ed8466e83e1efaa151c1b5f8e211cb262023ce83815dc4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7446

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://cructi.ru/uplcv?utm_term=android+tabs+in+sri+lanka PDF link annotation
    • http://robalton.es/Albums/images/file///68517579813.pdfIn PDF document text
    • http://htwy.com/upload/file/166408962.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109140208562931.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/wuvolukanumibunox.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/72881553148.pdfIn PDF document text
    • http://special-pharma.com/upload/files/81755760804.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/fifowilalofojo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfaf0301b---64836404382.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/11548296947.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/duzorejakaligozuxajopuzag.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/76855669142.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210910_181751.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/nuxasopafavagososenokag.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/76962410430.pdfIn PDF document text
    • https://endobible.com/userfiles/file/movadepedigiredesanire.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/bosagakowegutoburukuru.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/5026988356.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/98260087935.pdfIn PDF document text
    • http://ty-int.com/files/files/60721184121.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/gisepepefibuxu.pdfIn PDF document text
    • http://recrute.fr/files/files/76593871333.pdfIn PDF document text
    • http://mebco.ru/images/file/48697229142.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/pinewilanopigoxina.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_off0000bf0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 10324 bytes
SHA-256: 6d470a95ccc70c852b85b15ac57e99bc97481d6453ff3421c821153f02a16553
font_02_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 18300 bytes
SHA-256: 0b67309b75d9fd545c1f2e2cb04ff996171c3c2f5957ef8ef3f0e3a3b357ef74

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