Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a3052db12a7241…

MALICIOUS

PDF

83.4 KB Created: 2021-09-11 11:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45338572ac761a5b6221ff903791cf86 SHA-1: 2721ee86685a279758497836598ae2f98e3a90a7 SHA-256: 33a3052db12a72415ab1d01b8f4ef571585a9b1f2c0bb0709585cc0defacf170
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to 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. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://savitaco.com/uploads/images/files/finenaxufakatozuruzeju.pdf In PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/losatesideposinubonajobo.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/27462420265.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210905021148.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/vafamorilawimitawa.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/46619059316.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/14050504162.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/fotubotewida.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/sabem.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/90292636542.pdfIn PDF document text
    • https://masukpt2.com/contents/files/19461504327.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wetefupalisito.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/kixodetuj.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/xebutuparixiduxif.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/bafebuvagabikowagotawapuw.pdfIn PDF document text
    • http://caythuocnam.org/images/files/raxipumumojop.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/fekineteze.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/tovep.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/vatibuxopog.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc9ad86e6---48752852732.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zokawemok.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/varos.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ff6b99cfebb0b001a9540ff8cc3dda0b/31159444042.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/paradu.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/48802346199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=plants+vs+zombies+2+mod+apk+latestPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC116 10932 bytes
SHA-256: 4d25290517843710e731880fd00702fd238cc346cf34b233d4008386f8839028
font_01_sfnt_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 16132 bytes
SHA-256: da3599785d691edba6bb1dc804d5dbf9cdb050cf7bdfa967d514dff539c0bfb6
font_02_sfnt_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 20736 bytes
SHA-256: 8b83e08b2f623a8e4d86df1e9de018d4b9c7bd0e04aa388a46d83676304e8d9f