Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc61e71aa54cfe6…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 23:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9aa99e946dbe6f20f56a232f1effd50d SHA-1: 30ab51e1264f0e715720e9cceb00e4a59895f261 SHA-256: 2dc61e71aa54cfe6bc1ae7f9568cd4e02dc772e5d3af74ba3e457cb0d08ed98f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to various domains, many of which appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam, by directing users to potentially harmful content. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://havilahbuilders.com/userfiles/file/57569188179.pdf In PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/95897918481.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/lozatinetexirabokazovuta.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/torukoronagiwuwunifoti.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/xawalikir.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/laxix.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613125da7f1d7---16053332543.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/92049030345.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/dewexonuforab.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/roborujuxiwudanixupuz.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b04958c655---35510921844.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/34732386302.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210908002624.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/ratirobusutavizizunatemar.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/jenilibolupovuselazib.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/25729926213.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/guwadetawafanudo.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/27644578756.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/27022117929.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/fuzavotap.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/digozizawijomaz.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/48281821445.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/naputurosinonajipi.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/wewufabo.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/varuzomaxopomox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=types+of+spiders+in+hawaiiPDF 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_off0000af7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7E 10616 bytes
SHA-256: 4bc99a407a96b2e0a084d0d44b1ed728cf800c9fc15a26898bc0db42e9ceb05b
font_01_sfnt_off0000c7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BD 15916 bytes
SHA-256: ded0b0286a39b1a79005c2d2edb1a5b171be69103896b4491ef3b3d7253413f6
font_02_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1