Malicious PDF — malware analysis report

Static analysis result for SHA-256 445f2cb9528f5196…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 19:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f74208903027404c545ff2eb237f7849 SHA-1: 4d63ed5048e10f16986431fd0868d08e363ad1aa SHA-256: 445f2cb9528f51962bdf8d1e25bd8a90efb7a7e565d47daf1ca2157b9644ab84
94 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis identified it as a PDF containing a link farm with numerous embedded URLs pointing to other PDF files. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts, suggesting a coordinated effort to distribute malicious content or phish users. The presence of many unknown reputation URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4212

Heuristics 4

  • 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
  • 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://rsvforum.com/userfiles/file/65578627477.pdf In PDF document text
    • http://vinaktv.com/storage/ckfinder/files/rexarolavefupepinekujoga.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/basikom.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/lakubunaraj.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/43942219776.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/jenanupogavukigekobofodox.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/lomasenaleku.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/93515425627.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3cb72e477---84114991039.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/19797586604.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/89661092277.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/55321196334.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/77173829358.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/37189599550.pdfIn PDF document text
    • http://www.pvvc.cz/files/79456789078.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/setotidipokowel.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/94709834223.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/47620009738.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/130915fde6932ec87a13f92f7efa5e37/25138502949.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/8751625923.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/xurakunimusima.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/pugamonojoj.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/69144311800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sp+player+apkPDF 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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 9944 bytes
SHA-256: 6b8e3fad6fd4df224bd34b0a750be5140da838aa3d64ffa3d56871e7c282225b
font_01_sfnt_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 20688 bytes
SHA-256: 3524772dfdb8c2996a71d154ededf85ef99a94812a782362526d44ea146c20b7

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