Malicious PDF — malware analysis report

Static analysis result for SHA-256 802c184e6b89fbb9…

MALICIOUS

PDF

90.6 KB Created: 2021-09-23 06:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6cb2da8f69814d690d425f2d7d3e2aa0 SHA-1: 1a6ee643ff1d834334a449c135bf088db3f322d7 SHA-256: 802c184e6b89fbb9ecdf337c00f8f4c14fcbff038226f3199552a05d96a42c02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://archism.ru/uplcv?utm_term=hacer+compras+gratis+en+juegos+android PDF link annotation
    • http://jingluo.net/uploadfiles/files/liwinotokop.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/df807e204046cf8a24a81e24618d7202/nebarobizaxowaxovime.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/sezibami.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/21231606135.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210921_025454.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/luzevoxixit.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/zudosazumotulosijap.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/8235895083.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/60985030374.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/sadawowilotip.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/pamotejer.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/77367017521.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/32967656051.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/8276508900.pdfIn PDF document text
    • http://df-2.de/images/daten/file/sosevadibijed.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/35849738048.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/vuvakokuronofa.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/3085015579.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/61047794399.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/rilidawoletifejotatasi.pdfIn PDF document text
    • https://membermimpi.com/contents/files/fepowe.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/33869691468.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340e180c582---8735743586.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/tijasovaripajuluxule.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/97614626239.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/26806197667.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/jegifuxuta.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_off0000fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11278 11032 bytes
SHA-256: 489e5587425d573000597267e52fbfe0b7a73f5d4a4287659081c58d86474543
font_02_sfnt_off00012bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 19080 bytes
SHA-256: f80e89e1fc84f9cd30b2911d3fbd1eab4cec5214a4d59f7370df7900411f4999