Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78f9ec04cf7b809…

MALICIOUS

PDF

54.0 KB Created: 2021-09-27 10:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 78c0c595acac1d99a621d12173560d72 SHA-1: a9d6107a1ec3346d13ba68b3ea5f96dfef5b430c SHA-256: f78f9ec04cf7b809909d82dbe80a5a12191f7e3228de0d19fca13fff94071a52
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are disposable. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8114

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://viettrungson.com/media/Files/68333991840.pdf In PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/wegijila.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/tefamokamuvomebuwageg.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/kutizil.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/93111536150.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/56f7df892775671c0d146d58aa0c5fcb/sisajadikegujoxaxura.pdfIn PDF document text
    • http://balalajka.nu/media/15208217342.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/zenojepudewubugujit.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/27588502398.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/netimegexa.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/68800383053.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/gesadesola.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/11781333826.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51127631290.pdfIn PDF document text
    • https://e-midas.ro/files/file/fepatidekewolaz.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/97231064793.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/73868123069.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/22062286764.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/valapisaxoriwuzewomafarof.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/debere.pdfIn PDF document text
    • https://medius.sk/userfiles/file/19431385028.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/10083871750.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/47778327725.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+lock+android+phone+without+power+buttonPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C1 14568 bytes
SHA-256: 05c39992553a7f499494e0d6b59ffbe8aae1ddbe79253f071b40f9936ac94157

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