Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c3542cc7ea8a0e9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 02:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27c72343f10703b6bc0c5208b25d2060 SHA-1: f1058bbd66c67bc69e06d504105155142489e6b1 SHA-256: 7c3542cc7ea8a0e9953f5280ec663bff586cced3b75f1d818949f052d9305182
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate malicious actions like downloading further payloads or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://vizugy.hu/uploads/files/nowajodixepufitoweta.pdf In PDF document text
    • http://sirindhorn.net/upload/File/dejazasirimed.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/nozevuketurukibeva.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/topefabes.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/gezesujobegekiwotuf.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613869cd91a75---datutazapukudipukotibiwa.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/givewutidoliwisajak.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/xubeduzuwibija.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/48139643873.pdfIn PDF document text
    • http://rafaelokazakov.com/file/26964055422.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/41319191291.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/basisunemilufewete.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/jojepuxagevidilegonuwikiw.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/madino.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/1676949208.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/97792600532.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/jobabikelaso.pdfIn PDF document text
    • https://fototipia.hu/files/files/45803881784.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/68535366066.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/logosoveminugadebozirow.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a2e46f42d---xoluvobizirudekafereb.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/nidakan.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/xavuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=jai+ho+full+movie+download+720p+blurayPDF 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_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 11284 bytes
SHA-256: 210c6b1f33bc6252444b43fb8ccb09be28b2a212d010db3567a30da286ae5739
font_01_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001076f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076F 21764 bytes
SHA-256: e9cb2c6e3608198388096762a77818cca21e75b33dd7032b2c87624faac06f2e