Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f83ee6f6865f70c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-11 18:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbef7a638300d36773ac93eacb6cdb7d SHA-1: e0acc5bd24d7ca4bd8900f8dd338c51b0e8936c6 SHA-256: 9f83ee6f6865f70c85b02621f78f964a6f4596a7aca9eee2f8b2cddf0822ae26
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, which points to a link farm on disposable hosting, indicating a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://rejs2013.cycling-recycling.eu/imgturysta/files/42095267537.pdf In PDF document text
    • http://z500.si/files/fokikubikim.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/48937486519.pdfIn PDF document text
    • http://giga.sk/storage/file/26730003444.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/11654579249.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/roxotizudodunimiwul.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/dudexi.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/69186673303.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/lirixogofijajaduken.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/49375334702.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da505185d---9501115467.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/20123853646.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/faludu.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/15147744908.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/98444015866.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/saritamamudevupepavak.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/bexomuwufezet.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/94474308649.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/28171359653.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/12611875506.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sosajobelanojamugem.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/mufidufitelukegepafu.pdfIn PDF document text
    • http://dezis.ru/uploads/files/jirizapujimoxebedupi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161395f557c8e3---44363294377.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/lusovafe.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/luwigi.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/99914305582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gow+chains+of+olympus+isoPDF 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_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 19428 bytes
SHA-256: 928548d241d7d2fa105d79e45f4ab9cf4357e00a2c374b6d82b3b59a279058ad
font_01_sfnt_off000110eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EB 10752 bytes
SHA-256: fa4f67e758fff24eb5748585f7afa7145ed149363129449e82029e74982bef9a
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1