Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd8e11c40e0118b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-13 01:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea846a7a6562af5e7cb3db6b3240b332 SHA-1: f0e3dc863d28ea0aed45afae2eb7884b0a4ace79 SHA-256: 2fd8e11c40e0118b4999888ad7b5b8396d5c1d1816d3f7458babd43ad85c836b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://metabolit-plus.ru/files/file/31216410921.pdf In PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/77052974346.pdfIn PDF document text
    • https://12waktu.com/contents/files/11256718613.pdfIn PDF document text
    • http://upakuika.com/img/file/19931686927.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/vexudepaligogutumapilaj.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/sevunokadi.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/rumofetuwarejawufow.pdfIn PDF document text
    • http://happy-land.hu/editor_up/2774423369.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/gofenofirivupuduzujepuni.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613df14363a45---16172934341.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/71547106157.pdfIn PDF document text
    • http://mebco.ru/images/file/xugefimizupuxa.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/66726246663.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/fakexabosixib.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/97443882957.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/tepajovuzumusenigadige.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/zafeka.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/51442999740.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/61728939066.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/levitobuxiwenuxu.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210913061649.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-13/images/files/15368417623.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/savatujetelidat.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rifube.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/cfsarh5b8ujri81qkohkkre5i9/wuzaruzixewuzizuzupexu.pdfIn PDF document text
    • https://harmony.im/userfiles/file/xipapaxugikepawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=aplikasi+format+kartu+sd+androidPDF 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_off0000b8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CA 15956 bytes
SHA-256: 7d8072aab5094afa0235242a45c4b2c7e40029d8a78afe8fef5ee4e153931b98
font_02_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 10700 bytes
SHA-256: db305db70dd53f2ae454a423625eb53d67000104fed6eb49d1db977ca6b211f3