Malicious PDF — malware analysis report

Static analysis result for SHA-256 985c7999da459cb3…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 23:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 038f0ceb809ef9443077f81604a64259 SHA-1: 6b5ae09b591231dc0f965e999e33f36b38a1c951 SHA-256: 985c7999da459cb341651e3f0116bbdd1889c0138390ae8ba58a877439a30f76
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of embedded URLs pointing to various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is structured as a link farm on disposable hosting, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=what+is+the+3rd+biggest+country PDF link annotation
    • http://sweepinstyle.com/userfiles/file/77716216376.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130619bc1e34---65288929703.pdfIn PDF document text
    • http://szwygs.com/upload/zawojunomunizexuma.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/61987074818.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/gatuwitisexovemidetusibir.pdfIn PDF document text
    • http://18554080.com/userfiles/file/basotizipunupefibebafo.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/risozepox.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/1316252939.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/43372794383.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/pofuxavaxa.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/30634376710.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/kukomi.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/fiviwapeb.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/fozamu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca7bdc3c19---wasewavowevujozad.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/65004648273.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/23031800770.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/15957896312.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/1661290080.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/solifepakisukuronupigumax.pdfIn PDF document text
    • https://hotelcorona.ro/files/15579181795.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/28551410422.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/af73c3d15690d71460c28e9358dbcf57/59435786238.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/zotolavefatilufobapux.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/tadolo.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_off0000cc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC60 17412 bytes
SHA-256: 4518c2b628032b63e5d8a8bfac2b05e89718d0c93ae50fce9228a291433fe0bb
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 11120 bytes
SHA-256: 957ef7c75afc64d194691254426fba34622a0faf55a97351cf1e9d1164843acf

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