Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78a270ea41235ca…

MALICIOUS

PDF

64.0 KB Created: 2021-09-28 06:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 30d3e7bb167e3172f55e11647662ba7d SHA-1: 1427932aaa8b0315aff0a5a99b22a6e2db9a3a63 SHA-256: c78a270ea41235ca460f4296ce6c13f47414cfad3c39066c974807f5f9a7dc3d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous distinct hosts, suggesting a tactic to evade detection or distribute content across many domains. The embedded URLs point to various domains hosting PDF files, reinforcing the link farm and potential distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5541

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 http://m-s-g.ru/userfiles/files/1867132106.pdf In PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/98407371369.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/wafewuguxafop.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210904235457.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/wovuwuwovotopibitibalomaj.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/rogamisaz.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f427f8e56f---6182848138.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-13/20210913222214736064.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/40040227860.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/37520191092.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/lurefimixodo.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/20491899538.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/gixekajorepa.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/rupopibure.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bacea7916a79646a6e5b39e48cad4cfc/62835314597.pdfIn PDF document text
    • https://negaratoto.com/contents/files/27061493369.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/solujaresapumod.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210913022815.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23325836572.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/falolilowede.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210913_223044.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210909_4C300E118A83B2E9.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/tezodanurele.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/18851522465.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/8156967227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=come+play+movie+online+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FF 16592 bytes
SHA-256: 416ee05651bf78b5ad18fe1b497fcbd0b7fd4d26bc7b507775a9d7f9cbfc362f
font_01_sfnt_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1