Malicious PDF — malware analysis report

Static analysis result for SHA-256 6195fc5855ee31da…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 18:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95bbcecd955f8f87414c37acd885497c SHA-1: 9cfc2cd3e1a72caa0825407c8cc9020685514d0f SHA-256: 6195fc5855ee31dae0e66e8dd474bd6e4e232b2d8dff543485539ec7e7206466
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://markyatirim.com/resimler/files/fewojovudid.pdf In PDF document text
    • http://koddous.com/userfiles/file/xejitufigawogerurad.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210914_052335.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/gavamedasuxigorudewer.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/tumifulaluvizijijunufijob.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/51ca5de4acff832dc5a6c3dbd2112c8c/58488823758.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/46835987949.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/88243089189.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/rulexisafal.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/litilogiwutisizebatutuwev.pdfIn PDF document text
    • http://talesma.com/E/file/lijuzurazoxabapemumaken.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/timogazupevikob.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631461127.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/2487558055.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/73822377972.pdfIn PDF document text
    • http://rc-modeller.se/images/file///550746654.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/zajumikov.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/35236702551.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/tajafo.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/04/bavigibefemepepusuzeb.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/povumuwunomelexujurizofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=things+to+have+in+minecraft+survivalPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/faxebekukedumeri.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000d3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DF 10912 bytes
SHA-256: 8840ba43b7606688bf5fee39235b77cf967d6de5f23f7d102b8d5ba96e2a14ca
font_01_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 17476 bytes
SHA-256: 60283416ef52949d79a8cbfb6b8989ef70db8e8bdb8b2cb60d04e7fde0ca3681
font_02_sfnt_off00011a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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