Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c31e4d93bdf3d9f…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 21:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ecafc3478210ec01ac3c49fc27c8e0cd SHA-1: eceda89aeb0d73602e1ee5929edcd262ad2de879 SHA-256: 3c31e4d93bdf3d9fe1eaf986d71b31497c1b39b7c6d75768e6ec7fdd6c5eee46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=new+redeem+code+genshin PDF link annotation
    • http://zae.me/datafiles/file/1274940043.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/marutumelogiperuxuvazi.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/sesijexabidegef.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/26045293727.pdfIn PDF document text
    • http://rjt1.org/upload/files/22682234918.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3tps833cho9mfdm34csi0lgkrs/katiko.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210911_1661C8133BDA21D6.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/tapesediguvuxaputiwoxem.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/82578712240.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/268200337.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/binapirevotodazikow.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1979030969614a1c9912612.pdfIn PDF document text
    • http://methese.com/upload/files/pupiposutifasa.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/31233867700.pdfIn PDF document text
    • http://tchid.net/userfiles/file/16554478416.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/kasinemejibarazivafajaza.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/kusif.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9de51307---mutojomepuxanisipe.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/jixorafomifeberamaxovupax.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/womimapigopatixezagubiti.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/5678798663.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/taxamos.pdfIn PDF document text
    • http://sdes.in/uploads/97565626541.pdfIn PDF document text
    • https://thaodienland.com/fckeditor/editor/filemanager/connectors/php/temp/file/95900681223.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_off0000b009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB009 16196 bytes
SHA-256: 92789f0320a8b7da2f0ca76a2d9cebd79c5cce5c7dd35d29b38bbec7204c394e
font_01_sfnt_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 10572 bytes
SHA-256: 8e7cac0ffe5e53ade5dc93b659e6de528e8afed07482da000df49a9446f2a049
font_02_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1