Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5bd61865724429…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 18:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c76e1dfe456f69e21edc935625011d9 SHA-1: bc121e0b69bf59d5197c6b78c6481dacbad6cfe9 SHA-256: 5c5bd61865724429eb4f29c7395caa11e1520003db7e5d2133ab67bb5575133b
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 presence of numerous external URIs, many pointing to disposable domains, suggests a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://udelimpa.es/ckfinder/userfiles/files/risezaxodajoroxuzetiluwev.pdf In PDF document text
    • http://www.oomewatersport.nl/upload/files/53371175924.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/29711434278.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202194208119724.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/68656968797.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/14724614557.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/mibatapovuzoxitikerife.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/70363301052.pdfIn PDF document text
    • http://full814.com/upload/files/38303051424.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3b347925---7944969350.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/kefanofunonogijo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/6615075947.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/wimexodatozosipotuwemew.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/5182267000.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/11062048960.pdfIn PDF document text
    • http://erex.hu/upload/file/89602415868.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/36766416559.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-5/20210905194714745564.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/21742487766.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/losenazugeruzebivezakejav.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/71830939577.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/88131019747.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/xebifomuxefebesita.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090514481283.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/7451196430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tuberculosis+indonesia+pdfPDF 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_off0000cfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBE 17760 bytes
SHA-256: 1bb729a6def52a79a9a5a7ddfecf13d3b5af624a34b9c348f83517bf008b4277
font_01_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 10716 bytes
SHA-256: a5f3063a466b78d8370701e95cfc79096918b7464ed4cc84e042845094086107