Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5624817a61c43f…

MALICIOUS

PDF

72.8 KB Created: 2021-10-03 16:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 017bfd1895f3ea2756cc0011df085b3a SHA-1: f6cb8c8a91c124bf2fd5626725d179e345ecaf4c SHA-256: 5b5624817a61c43f0cb2be468b96b781df76ef98bd15bba8ad587e80355b6aaa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seashinechina.com/admin/fckeditor_upfiles/file/2021100218283880554.pdf In PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/zitexova.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/xiporofujamebukogav.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161589ba3c9cf0---92568871282.pdfIn PDF document text
    • http://geodez.com/pliki/file/walagu.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/xirazidifusurogoza.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/pimosogadoni.pdfIn PDF document text
    • http://abwrva.com/uploads/files/19042266261.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/fubow.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/bomamepudologukenigipepi.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/lowufutojajokakipi.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/40131326868.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/setiridelexowal.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/53508309013.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/pijapo.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/toravebifafojiwurewinanaz.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f925a43f93---zisologapufudu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/kokan.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/12183334046137455f3ee5c.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/80392270677.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/58858166867.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/lokikujepopetuza.pdfIn PDF document text
    • http://client.diffuse.info/files/24675133114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+are+the+components+of+communication+discussPDF 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_off0000b4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 10932 bytes
SHA-256: 79ba7111f254a2771fdff2e7314431ca48b25101812122365dab9e6bce19e553
font_02_sfnt_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 18044 bytes
SHA-256: 03f8710d5b53e43e250a9aee15d37daeaa1a5d6ec2935263a0b52590a4a5a25e

Open this report in the interactive analyzer, or submit your own file for analysis.