Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a65d47a986f550d…

MALICIOUS

PDF

93.7 KB Created: 2021-09-22 11:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5d8e8cf2d8cc03121c589d5edb850df6 SHA-1: cd3d978d87e284efb5b8c3afd47372802e4caeed SHA-256: 8a65d47a986f550db9d8e78511ff3d0510d85ed76aa5318249e2425ab919aa25
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and exhibits characteristics of a link farm, containing numerous external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts and links, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4477

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 http://basyapiemlak.com/yukleme_klasoru/userfiles/file/zekifukulepu.pdf In PDF document text
    • https://iskoruma.com/upload/ckfinder/files/radoxutufirurozozilapibil.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137759b03b8d---butudude.pdfIn PDF document text
    • http://ihdbd.org/upload/files/35066506166.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rekakogine.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/rozurotegonefej.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/ladutujejefolibebuj.pdfIn PDF document text
    • https://online-wums.com/files/files/36878969797.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/24248864594.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/luroludamudajigujanimos.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/87104583330.pdfIn PDF document text
    • http://hijoin.hu/editor_up/larekoxixo.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/xulasuwoduwe.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/83464327978.pdfIn PDF document text
    • https://brakos.it/file/86008688488.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/mesurusad.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/pigurod.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/91702278202.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109180856346684.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/22ff143d4bddf7e6dda91dbb8cfb626a/bimolujaravoka.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/jevojakixoxatigujetanagof.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/28785841362.pdfIn PDF document text
    • http://lblussana.it/images/file/85823955265.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021092013014382.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/kabavuganilajomatuxixebag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ethical+issues+in+qualitative+research+pptPDF 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_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 18784 bytes
SHA-256: 2c1b4cb52d2255d0795ffe895200cf7095ec6969eee8e288556102e9fc1a8a2b
font_01_sfnt_off0001444a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C61 10644 bytes
SHA-256: b9a0d9492776cd0ca7c05ff24ab0a9c2d82bac23ec88f39c91ef83029517fc02

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