Malicious PDF — malware analysis report

Static analysis result for SHA-256 d797190e3d7b4187…

MALICIOUS

PDF

73.0 KB Created: 2021-09-11 22:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28d72404b48ed62ef0a040927632a6fb SHA-1: 7644f0668f38667c797cee254881d91abc76d280 SHA-256: d797190e3d7b41876554b8b4ba42645b3e92ae7de62f9691ddad1bacdd54aabf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to PDFs hosted on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://wanyuantemple.tw/userfiles/file/90035112364.pdf In PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/42855248168.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/43141995871.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/kepeporarut.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/27797429421.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/rodobupekumeweladepudit.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/25960624224.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/91572038483.pdfIn PDF document text
    • https://hssanesteban.cl/files/xedikevadofudimux.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/wodejamesezezakozabuni.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/81112135027.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/65854017870.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/77283149035.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/patuvutugifes.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/wawatusebuwitapujiratux.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/59989648133.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/rifozarotipij.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/58796744175.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/nimaxuziba.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161355da6d16b4---kolufoloterev.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/vomuvajuzijogutovolu.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5099887605.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/mudobigobin.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/komorezuregazozubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+apply+themes+on+androidPDF 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_off0000bb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6A 10848 bytes
SHA-256: bcbf3e17802d7df0e0c0b2e099f00ecc08eacb93b58941a20982677d5919bc1c
font_01_sfnt_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 16176 bytes
SHA-256: 44c8dfc939767ed64cf439b4f64e9f1b84da8f27645dd84d031179ce2ed4ee08
font_02_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1