Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ecc8c441927c1b…

MALICIOUS

PDF

88.1 KB Created: 2021-09-10 07:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 89f970102dbd46203ddc6e3662668acd SHA-1: 677e7da5fad00d16b47208af45828f14384fe873 SHA-256: b6ecc8c441927c1b3cf2eb30e3a25c1b715d5b7aaccbd03c4cefae603c918834
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic flagging it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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.
  • 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 https://dallaslandscapedesign.com/media/files/zumorozoju.pdf In PDF document text
    • http://capmar.eu/userfiles/file/xatapu.pdfIn PDF document text
    • http://uchid.com/uploads/file/zuteripemolawa.pdfIn PDF document text
    • https://techlan.pl/files/file/2064759678.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/felonoxuxamoxodis.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/97443732502.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/pebapefokajojazefodaboda.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/dalazawovazotujeguluka.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/pebida.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/62838371233.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/19351262413.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/tigunavasutit.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/gegaw.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/wuwadozezogimosi.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/kopogumi.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/56244559444.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/tipefukorelunu.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/mafunugegenazuwig.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/22164632812.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/suxepelavosososab.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/forevuv.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/47920595653.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1c3bfa6e6b51e5175ce21d5772bb939e/mimuwajikububora.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/tetuxanuzaxu.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/gudatudesalonadobaxaxupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=shoulder+pain+radiating+down+arm+to+fingersPDF 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_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 11208 bytes
SHA-256: e5b35c9e86d5c0ee3f5868faef9205b7cf93f7c6020e3dcde73f57519b01a4f6
font_02_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 16936 bytes
SHA-256: a27541ee2c9f1d2edb95f6515e494fb6ba3bd2d08d41202b1e51acb0951ae705