Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b3adfc69c39c11…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 21:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98431809791c40f58794d681ac17cc1e SHA-1: e320b9523dae1afd291a4c928360a5d2ee1b1a75 SHA-256: d3b3adfc69c39c113eb85ef7f2776836559b6e4c841cf45cba5ea858977f7171
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through the linked sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a deceptive tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=blackmod+dragon+city PDF link annotation
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/xuvibuguvor.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/6152306995.pdfIn PDF document text
    • http://forti.in/userfiles/file/71185995784.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef02e3cb9b---79132501987.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/19515139821.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/rarik.pdfIn PDF document text
    • http://cy2hand.com/userfiles/58005390220.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/lenubepubuwuzolujapikubam.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/manisikonejiwekabijememo.pdfIn PDF document text
    • http://thuannam.com/image/files/jabakofid.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/gejomedumotive.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/xirixevokurijepatopebikas.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/22732701944.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/sukirizip.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210903050721.pdfIn PDF document text
    • https://wmu24.ru/media/file/7745358157.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/22314619586.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/72022464638.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/vorolewatalafagologafe.pdfIn PDF document text
    • http://skupka54.ru/upload/m/63022562607.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/jesuruvutedozawanaletemut.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/jizilixobimupixepix.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613be51a9da78---26241350156.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091320120873499.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/8447710007.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/89797989971.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_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 10672 bytes
SHA-256: 25e2e23c95d4215f69bbfaa6e827997321e53cfebdb53e4d7eeb7e5a7d2c8f9a
font_01_sfnt_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 18616 bytes
SHA-256: 8750487f7ae8cacba7af3336a4135e6cd6022ed08f2d9dd3bc4a0e73190ac9e1
font_02_sfnt_off00011915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1