Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffd0863c77dcbd5…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 08:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0f0dd6041c0e6627443ec620d74b5e53 SHA-1: fe1eed6036229d4ce986de3ae7bf21af5a186eec SHA-256: 8ffd0863c77dcbd5f0198415c9a7de0f015c9f553a517677321231372c7745a4
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many of which point to potentially malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://johanbjerke.se/userfiles/file/96177811580.pdf In PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/45572666701.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/gekexepivozelesatix.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/fezugunazujaziki.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/88599243961.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/75291572235.pdfIn PDF document text
    • https://media-get.com/userfiles/files/bomuteti.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/65140594618.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/41694441568.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132594e93a22---wofexipasideveku.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/38345543731.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/33732114417.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/lurimabo.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/46683277247.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/rebat.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/19318348944.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bebewutudogiwupariwixu.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/16753675794.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/xuluputarutawon.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/78557742698.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/gazenitanigike.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/31027800744.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaae8e3a57---63939304212.pdfIn PDF document text
    • https://norservis.cz/files/files/8773739892.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/texekowotu.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/84576978461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fnaf+pizzeria+simulator+unblockedPDF 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_off0000ce2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 11148 bytes
SHA-256: ac1926d2f481fc8712ff0ece9eb32bce0c75850a96fc7c0d6f256f249214c3a5
font_02_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 16932 bytes
SHA-256: 45739800bde1bd9b54a6860bdc5d67d53d108eee2f7ade2baabfb76261d9d471