Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8f8ea470e3d518…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 06:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 723a6959289c4de7859c1aaf73fafbea SHA-1: b184a64c3469ff4616196dcf781837467a92f714 SHA-256: 5f8f8ea470e3d5187eda3a3e197c871fe7d4de83b85ba19a8fc79ebbf378acf7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URIs, with one directly pointing to an IP address, suggesting an attempt to redirect users to potentially harmful content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports the malicious nature by identifying a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://ellissi.org/userfiles/files/11954184213.pdf In PDF document text
    • http://xingzhongjing.com/userfiles/file/20210916204605_1894652735.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/rexuritejitofibopubamode.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/71862337491.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210903_031401.pdfPDF link annotation
    • http://dungcumaymoc.com/Images_upload/files/budofudemuj.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/72322693976.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zufotunoxifuvoweni.pdfIn PDF document text
    • http://martonelektro.hu/files/file/rodaposofimeselasa.pdfIn PDF document text
    • http://zamgph.com/uploads/file/061508028056.pdfIn PDF document text
    • https://digicpictures.com/downloads/zuboxewoginakozif.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/gituwogabosov.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/sesuzofisun.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/19465368824.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/84742438981.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/xapaleva.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/rexewiwetunisul.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/9480233299.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/xebumilozemowunesipoku.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/vafididijonukemuzebebekub.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/lanijezosuxenos.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/ledikurewedod.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/fowejebina.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b04465e59---16411664245.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/72249214951.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/25939544154.pdfIn PDF document text
    • http://iccarrentals.com/files/file/54505443070.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/palupisapejojab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=nba+2k18+obbPDF 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_off0000b648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB648 14660 bytes
SHA-256: f8ce7a99662c5e9e6900635d92484b9eb7034e094bceb47e8dd5f689920359d6
font_01_sfnt_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 9952 bytes
SHA-256: 70f7acaaf7168d112500bfa73b7a7f9836d5b8e12c0e102a6d211c801c7ea89c
font_02_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1