Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e57be7241172d2e…

MALICIOUS

PDF

73.4 KB Created: 2021-10-04 13:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 83a6c2d3156deccd192b1d0494b066d3 SHA-1: dc145989a164b647637edfdd93b25a7f9cd82766 SHA-256: 2e57be7241172d2e9a28069f56f6203e4f073444ca5ce05ea98eaea5e8014477
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is structured to host many links on disposable domains. No scripts were extracted, but the overall structure and URL findings point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7989

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://zhbiotech.com/CKEdit/upload/files/zalosupinefuxaregif.pdf In PDF document text
    • http://wowbond.com/upload/Fckeditor/file/kogulufojovadof.pdfIn PDF document text
    • http://praguetransfer.com/files/file/20726403412.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/folitulegelijowirade.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1632254762.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/857429868.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/10980159292.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/dezoverefunovizonaman.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/8998142980.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/bolifujiluxudaxorepiziwa.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/22/file/20210922_020804_144.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/99579101915.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/981e13983bc6c7bef5350dd4cc397159/49164506719.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/38190348728.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/3742343657.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/32971755955.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/85908773722.pdfIn PDF document text
    • http://domuran.pl/files/file/gesefuremebexepana.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/93102606527.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/9962431938.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/lenidifowedalebozuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tonight+show+withPDF 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_off0000c2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 19216 bytes
SHA-256: a816cd67bec3b0c076912789260f7cc22cc82d8a23f2eaef4e4e08ade2fe50f0
font_02_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 9996 bytes
SHA-256: 9751a3513ffa62b5c9a3e4a4537cff88b5258a241727b1efba70edc29db33e12

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