Malicious PDF — malware analysis report

Static analysis result for SHA-256 424041bb2ace6bef…

MALICIOUS

PDF

74.3 KB Created: 2021-10-01 02:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1356d6cf32902d5387d72cea382c19af SHA-1: 4d889e248e268a3780979a54f6f1d2c2dfa7fa4a SHA-256: 424041bb2ace6bef1d8a61ce87b0cd73b042cb509afa590a13d576313111da0d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to PDF files on unknown domains, suggests it is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the PDF is part of a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1efa3871---lugowu.pdf In PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/54665402986.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/napogawijune.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/sabubojajil.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-26/20210926151743685153.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/98106811465.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/rimilurorutumusenupe.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/34987772127.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/bibodamifibomasivuzep.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/gevazovusulun.pdfIn PDF document text
    • http://lgassociates.in/uploads/42741151846.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a8d062f9aaab6b7cf962e14664fca450/bimevanejalikodo.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/logigefo.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/93781643514.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/28357086248.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/danafekesik.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/vizufixakesub.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/sazarawoforutib.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/bejitik.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/45793049843.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/nexunugefidigubutul.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/sezusulobevuminox.pdfIn PDF document text
    • https://micsys.in/userfiles/file/92395717285.pdfIn PDF document text
    • https://bishopsalamatkhokhar-org.bskm.org/userfiles/file/75036407346.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/36745454403.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/49068042511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=amapiano+beats+maker+apk+downloadPDF 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_off0000ba3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3F 18140 bytes
SHA-256: 6e127342935bc5db8d6176dd700f70aa8db11d5353f6f67fafe5820e77d2c9bf
font_01_sfnt_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 10852 bytes
SHA-256: e109f8ff4a8ec1dfb6bcc9c9908ad0866578f6375b57f153897fac84dbb24e7d