Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd233b9644534e9…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 01:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cf0b954722b30fd9d410e1bcfc30a096 SHA-1: 0f5be7856c81021a9dd595656c998aeb02aff34c SHA-256: 9cd233b9644534e97cd68f1c2eb157b77c29e0ea6b10cd3885f013d347989f4f
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 hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of creating many links on different hosts, suggesting an attempt to obscure the true malicious destination. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6181

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://idolyokocho.com/js/ckfinder/userfiles/files/20926948177.pdf In PDF document text
    • http://tcsklife.com/filespath/files/20210912233602.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/17983132535.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/nutasowinudedamibipujes.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca91dc9b54---84893717708.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/79822844896.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/8255907523.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/75099506563.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/rafimumomen.pdfIn PDF document text
    • https://conrays.ru/f/data/3921934028.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/53767886602.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/zogidif.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/subisaliw.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/jomumuri.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/loweb.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/63661799153.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/tidenesiveg.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/vutagureperosubufofujo.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/lodipomogulej.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/79197016180.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/39382297393.pdfIn PDF document text
    • http://aa-nusd.jp/47608571071.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161473490a714c---61739429753.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/29740298675.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/51235584224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=clipboard+in+android+mobilePDF link annotation
    • 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_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 10460 bytes
SHA-256: 3389999a74c3ce33536e003de67fa74bceb838130f399e05b343fe800a374f20
font_01_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA6 17812 bytes
SHA-256: b45a57da091b01079522b2f67a5aac428cc16c05447f2f64061da2cd3f256660

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