Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef2bffa2e1959d0…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 14:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7518f9e599ca391f3959542f754f568 SHA-1: 5e6e4ca4b78290b2ed92e456bc037dc526f3ae4c SHA-256: 8ef2bffa2e1959d03c0b930ee3599648cab5d3ec8fced2f2fb0271a7cfd76206
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or link-farming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://exhibitproplus.epponline.com/mentorfinancial/page_images/file/jirejigup.pdf In PDF document text
    • http://zoekidsworld.com/userfiles/file/noguwup.pdfIn PDF document text
    • https://intersat.lv/files/file/11421584831.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/xixisusuzuxefoxowasoseriv.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/44921991682.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/62425317424.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/62805969248.pdfIn PDF document text
    • http://edeins.com/userfiles/file/lovesowusivaxan.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/zesetudiz.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f8fef2ef4f840ec1fdb55cd4e250da6/sevufufarerifodib.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/92356280798.pdfIn PDF document text
    • http://tabletopad.com/images/file/wumugutubilomodar.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/51408805513.pdfIn PDF document text
    • https://filetorme.com/upload/files/wevutusozesaxufiri.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/ferolakavazedonux.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/manipovisuz.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/mukudifosuxozepibo.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/32239596501.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/xovamofarovuwabi.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/5036352608.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/c4prqituflm2sllj5fftkuktf6/legafudowiv.pdfIn PDF document text
    • http://domuran.pl/files/file/20805095212.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/sumowefukopavesanumowowex.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/vikogowufasovolebire.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/41931387434.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/gemegirififonopod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=can+you+screen+mirror+with+chromecastPDF 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_off0000b1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E2 10780 bytes
SHA-256: 4a7175fa29bd3db71b211b9f950733ff2027a437a9caf3748cd2b989d8c89401
font_01_sfnt_off0000caa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 14760 bytes
SHA-256: c31b9f65da565d4bc56293691d0b286cd70c27e9a6e0699813bb8acc95afecf5
font_02_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1