Malicious PDF — malware analysis report

Static analysis result for SHA-256 398b64e602778461…

MALICIOUS

PDF

73.5 KB Created: 2021-09-10 00:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 59e2c5d4ba2eaf93a020c42d2ff36cf2 SHA-1: 50aed5582d3da2bd3a09525f2d7165660c857c79 SHA-256: 398b64e602778461ee7d759fb64c8046288e1b41258fa754cd5f3dc681101d1f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://shukokai-voves.fr/userfiles/file/12984218604.pdf In PDF document text
    • http://abaj.cz/UserFiles/File/91992938234.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210901_F90EED6D54148E49.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/10078650520.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/womoluxunerovezaritux.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/47282620609.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/bewoxifobagorekurin.pdfIn PDF document text
    • http://linza-market.ru/upload/files/36719625615.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/93810640672.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/21019842944.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/56980323511.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec45c58c4---wevogatutavuzikilizewuliv.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/vumomoxixafubut.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/67534803873.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/35867051451.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/55807240106.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/98513563363.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/88788846849.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/pakopozadosojarakuwopuper.pdfIn PDF document text
    • http://4rrecycle.com/files/file/76835197631.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/87733776312.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/piduvejapep.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/zokasetitosogosuwizaduti.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/vamutukekatuni.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbd0bb78b---67319711455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tiger+blood+in+the+mouth+full+movie+watch+online+freePDF link annotation
    • 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_off0000bb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5B 16652 bytes
SHA-256: cde1a4067454910a33888d4d204b81227816e4c2ced5ffb0ff40db32a088c477
font_01_sfnt_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 11108 bytes
SHA-256: 9e5ff4096dead1d52139c60ee0aefff6dbce97604e6427e13e8e5d61ac0d2b41