Malicious PDF — malware analysis report

Static analysis result for SHA-256 6026dc547070d559…

MALICIOUS

PDF

70.8 KB Created: 2021-09-23 17:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4cda3f8d7903d95b5da9e2d611e1a74a SHA-1: 8c6c04862216b7323f97ae7c15b5a3e795ddecfd SHA-256: 6026dc547070d55947477a1d72a923cafa3345b54708b925ce2eac14a36acc58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://fullx.net/files/miwunilezamivewebirizuvi.pdf In PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/64095278622.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/ruvenuburadedo.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/dowefeluvirogitopam.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/64540706034.pdfIn PDF document text
    • http://jfe.hk/userfiles/92402870881.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/67008466955.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/pejozelawinik.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/57478404196.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/70170684183.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/49626915673.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/tuzarekulapifisakelisavuz.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/4208951348.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/40245196031.pdfIn PDF document text
    • http://meskerjager.nl/media/files/2636022475.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/vupejoruw.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613863f4d51fc---kegisotadawivin.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/56044991976.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457b5fc5adb---70452649276.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/88795526051.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021971530173550.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/fitebus.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/xorenikutagegafuvije.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/52593659316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pixel+art+mod+apkPDF 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_off0000b27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27C 10476 bytes
SHA-256: c7ca42d7377a7c427c284611c56267b36039bc130824687902f882f43b0b1086
font_01_sfnt_off0000ca49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA49 17380 bytes
SHA-256: ade04c11fd0e7108445bbdaa3b17dba0225560db1ee0fa65a318c6fe69c2d663
font_02_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1