Malicious PDF — malware analysis report

Static analysis result for SHA-256 788142206559abac…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 10:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a96cfaf1bd085665004863ead543327 SHA-1: c545526cd9c8bd00cc1da351935a4f59acdf33f3 SHA-256: 788142206559abac54513267e66c8d9c5df08e4251e21ec0bfa942f49244cb0f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains numerous embedded URLs, many of which are structured as link farms. Heuristics indicate a 'disposable link farm' and a 'download button' lure, suggesting the document's purpose is to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=vplayer+pro+android PDF link annotation
    • https://tyko.pl/userfiles/file/2452866710.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/74051322966.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/98719432335.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/gunorutavafutavevinaraku.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dce1862480---17676107133.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/sidagukepifunopadixunorun.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/17896077579.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/33943041068.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109111059533239.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/gigerosamipidijavimewi.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/15836802951.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/81723698216.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/movojosasulila.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/xisiwinulakusajude.pdfIn PDF document text
    • http://demkapi.com/resimler/files/80704876370.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/mumuzuvuzaripiwu.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/28838714702.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210902214657.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/jelagaxibuluvudazirobawu.pdfIn PDF document text
    • http://nemalipics.com/54293275121.pdfIn PDF document text
    • https://ms02bet.com/contents/files/57418390239.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/gusifipotenukujakujegega.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/90622337847.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/91653002995.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/37461601098.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_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 10200 bytes
SHA-256: 0c76efe82bb683d8d264430ed295d9ede59229741febcd23546c13d66c67827a
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 17840 bytes
SHA-256: 8b2b989bedb1379fff2ca51d8f961a8603286fe9086b17d41c184f1e5660970d
font_02_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1