Malicious PDF — malware analysis report

Static analysis result for SHA-256 520c0e4e57b52e05…

MALICIOUS

PDF

81.5 KB Created: 2021-09-14 13:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b3da377f58e18d9ab21a0214aaa1d305 SHA-1: 5ee5d761fe61050dd5a7c17d6bc09bcf1d22a66f SHA-256: 520c0e4e57b52e058b099f7b73800e97d481ba2880788b441440a3208ed3b8a0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a link farm, with numerous links pointing to disposable domains, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://tianlanlawyer.com/filespath/files/20210908172151.pdf In PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/dapevixis.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/fezur.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/medijadamexesakev.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/zovotoden.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/76862162864.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/dibubojoti.pdfIn PDF document text
    • http://asid.rw/userfiles/file/16008811502.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/15079069486.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/purojagevejulopo.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/74656938179.pdfIn PDF document text
    • http://hla.vn/upload/files/74921712094.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/97647192976.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/19078323087.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/43653325532.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/levere.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/fifujomuwam.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/solububamanavomuwadis.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/56843810393.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/21587249159.pdfIn PDF document text
    • http://klinok-saintp.ru/files/pudokusixefapomekogogobu.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/bigobufidojixamanizu.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/73606370602.pdfIn PDF document text
    • https://sainaudit.mn/File/13142066264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=naruto+the+lastPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A2 20544 bytes
SHA-256: 4ad546bca871ac8279e82deb34ccf96d4571fc96a8f182bf7260346becd0a0f2
font_01_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001036a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00010b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 16232 bytes
SHA-256: af293b2b60dc5e826b00d8953dd18f37a59bdd939ad7d7593537948814e7f124
font_04_sfnt_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 10088 bytes
SHA-256: d9b100706eb2edeec3014a290590305b1c0879214e13d38033886ce856086faf