Malicious PDF — malware analysis report

Static analysis result for SHA-256 0283ae26a71899d4…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 18:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 64ec3663abfae75246c8b40f160a657a SHA-1: 3495bdb49ad0fdc332305c02842e2bea95ecb2a5 SHA-256: 0283ae26a71899d4dcb12e86458ef1d11730a5b9cba84d974573322f72be1630
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains a link farm on disposable hosting, likely intended to redirect users to malicious content or facilitate further infection. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to lure users into clicking malicious links, aligning with phishing and potential malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://krossi.ru/images/content/files/89021207576.pdf In PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/dexanowapemexurevi.pdfIn PDF document text
    • https://tuinvandecruys.be/file/lojivumolisob.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/xafefativazotarewogufulup.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/kenenixutawadonepilofe.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1dcadf7efaa38b370ae630d036dc7ab/79606013986.pdfIn PDF document text
    • http://scarpatti.com/files/54862438611.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/17385863313.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16136bdeaab5d3---wevalasemijidevagopipidok.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/8065183571.pdfIn PDF document text
    • https://oferta.lt/i/File/xozalumobitozofasawuzor.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/14365516972.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/59948356095.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/87159788674.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/vejefokopoxome.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/vabijibegejadu.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/77053253546.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/87806389277.pdfIn PDF document text
    • http://finchamauto.com/pics/xesijukazusoraxoleda.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/51726672710.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/99776217382.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/54319078302.pdfIn PDF document text
    • http://373113.linker.tw/files/56470863264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=omegle+instant+hangoutPDF 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_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 19208 bytes
SHA-256: 9e821ac6939761147d622456a25a7e1d93737249d68957922be43c59071fbf14
font_01_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 10580 bytes
SHA-256: b6237fc6c6feb7ad141d5fba3f4db69f101007a7a18da650cda7be8b93330ddb
font_02_sfnt_off00012e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1