Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bc93ca55426704…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 14:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18008c9fb426af2d1aa3f76085a277df SHA-1: 75981fac360cd02aa0bf5e0f693ac7b3eee5d4ac SHA-256: f6bc93ca55426704672f22268fd0f27267f24ead7a0dd133064e5f256344b0e8
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 URIs. 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 presence of external URIs, even those marked as benign, points towards an attack pattern involving directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4649

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://metallpress.ru/files/metudamamaxabusoxonafis.pdf In PDF document text
    • http://nikolabartakova.cz/files/file/75252574479.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/sepobixivevizazitazopofup.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/93557294384.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/fesaze.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5b7cd312e---kerubedugatenowo.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/8351261439.pdfIn PDF document text
    • http://npas.ru/pic/file/58997794403.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-24/20210924190404922286.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109070322037156.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/felaponasoxatatidumipijin.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/62351373601.pdfIn PDF document text
    • http://elitk.ru/_files/gazesilip.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/viwakolonerenelelok.pdfIn PDF document text
    • http://skncn.com/u/files/rijopaxuk.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/50796755930.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/5171219727.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109012141452181.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143149a368d2---56394642947.pdfIn PDF document text
    • http://kccmaul.com/files/files/vigusuzanuluxojewimojaw.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/megolimorisimu.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/tiwudureruzux.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/dupikovakosujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ride+ninja+game+downloadPDF 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_off0000b33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 18472 bytes
SHA-256: 0c1d5a9de7bc33f2af428cff66368c2a3bdfcdcce7494b9c297f7534dd3f74da
font_01_sfnt_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 10488 bytes
SHA-256: 33236d8bf1481246d9d657c5b2be866a3bf8a31ee5ace68f5dbb6bbe14f88556

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