Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfffd888032d759…

MALICIOUS

PDF

75.6 KB Created: 2021-09-14 19:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6cc634080e8fd1aa8a97626a1c92d222 SHA-1: 6c340564d25e3e41face6d96cf5e4824a4f15eca SHA-256: bbfffd888032d75914d677d754c066dbe4ad56987dbbb1bc778985385daea0ac
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7792

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://west-holding.com/userfiles/file/45908686424.pdf In PDF document text
    • http://zezoalza.com/ckupload/files/46729427199.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/1530138297.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/matuki.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/dilepasupobemodebofipez.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/bukufexavefixon.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/69041251417.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091416281235.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/sozis.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/79547080714.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/55677851887.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/42637224147.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/zejazi.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e21198a9fa---zofulitazobuf.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3853681ece4dc4a13bf43aeaa1723035/47723169429.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/1063762420.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/letonira.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210905055625.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/46031291981.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/77545928099.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/86641649349.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/rawereropomalur.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/koduxatana.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109032121182403.pdfIn PDF document text
    • http://muszempilla.com/files/file/buwegeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=jazz+guitar+sight+reading+exercises+pdfPDF 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_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 10984 bytes
SHA-256: fa52982cbfbe2b2ea0f60846bc2459ad61311e46e13d7f036c902b762fd1c224
font_01_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 17600 bytes
SHA-256: 58d2cb2483ab095dc7e1af575f377c06c3769867131e961100b2695e6705a40e

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