Malicious PDF — malware analysis report

Static analysis result for SHA-256 3559263143d59668…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 02:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2cafe685a64d2cb9caa81832d4d6219 SHA-1: b8b24e49f3ac749818171f01fa526c1887a9053e SHA-256: 3559263143d596686a03fdf1fc2fba1cca7a550442f892798ef9f3e58a1c6c0c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as evidenced by the numerous unknown reputation URLs found in the document, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://yukkumpulgroup1.com/contents/files/18620387757.pdf In PDF document text
    • https://fong-cai.com/upload/files/89274984072.pdfIn PDF document text
    • http://intertribo.sk/files/48473908299.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/ridoxufojiruxakisab.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/51815595854.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/posajinunat.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109090632198532.pdfIn PDF document text
    • http://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/85113889859.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/47459818008.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/29234666615.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/bufomudigosejidabaxafusus.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/roluvup.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/97043530739.pdfIn PDF document text
    • http://rococosofa.com/files/files/41498883173.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/nepovavetijipusitonatuna.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109040047429234.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/3d5cc6c893390f39f3a89282b2603d15/pexib.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109071721486363.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/83238150426.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/35462630764.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16131169188b2b---gibezakawegus.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/79916747883.pdfIn PDF document text
    • http://isvpro.com/custom/files/zanonutejaberebufirafi.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/kikogamavezafafosowafov.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210907025809.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/tadakipusotipiz.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/32582104286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+games+for+pc+windows+7+32+bitPDF 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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 17528 bytes
SHA-256: e7d8eb78f28c6fe56362cca7a5121539d19810a450aa613e5b5c1d22f7459566
font_02_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 11532 bytes
SHA-256: d0e7f938948fb8ee3a48f2737cce971549182664f24b4ec884e6a683922bd6da