Malicious PDF — malware analysis report

Static analysis result for SHA-256 175da12336b2f8a0…

MALICIOUS

PDF

71.4 KB Created: 2021-09-11 06:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0549ece2f98586fb7bb3042368f9da71 SHA-1: ccc42a344f7d7c92f09ef1804a3a77dbc045df81 SHA-256: 175da12336b2f8a0339e446fd28e503b949442d02248285468f77b4af7ab5f37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs pointing to disposable hosting, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it's intended to lead users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=lyrics+oh+happy+day+edwin+hawkins PDF link annotation
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/31497737404.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/vipofafuluruximatojoru.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/tamediripimemitano.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/53446814990.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48848126009.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/39187707389.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613229985ecb1---mefepusujibukadasujorilek.pdfIn PDF document text
    • http://freeorden.com/media/file/gejunemuxididoxovore.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/50259030817.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/sivujutes.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/61597848645.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/2857717285.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/62354899167.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/40345124049.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad4f26d71---20852253933.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/wekopamu.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/wuzigazonodabogexevite.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/82662511501.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/ribuxadadag.pdfIn PDF document text
    • http://aa-nusd.jp/rowetozuxegumufixa.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/wemofotu.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/xurot.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29997527188.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/18535065540.pdfIn PDF document text
    • 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_off0000b698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB698 16004 bytes
SHA-256: 1453b12572d7d8ea35987471f7c54edb24116ab8ef62fbbaa0368c8acf5295a3
font_01_sfnt_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 10716 bytes
SHA-256: 144d2d910bb33a25665eb86792ee41712475fbc17a6ab305758f0d31b8cae9da