Malicious PDF — malware analysis report

Static analysis result for SHA-256 afafa7b29eba0777…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 23:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ffc10f406dc64924a7633357b40ebbd5 SHA-1: f7c57fbf99aa3c5291b56e7c7e291bbdf31dd480 SHA-256: afafa7b29eba07778652b9a219e49ab096b6bea3da5ce4977b4ab76a62f0771b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to link farms, with one specific URL identified as a potential entry point for malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://zuche0551.com/upload/file/fotusisizomeneponilo.pdf In PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/79036200447.pdfIn PDF document text
    • http://asustainable.com/global/file/resavagefixo.pdfIn PDF document text
    • https://tckontrola.hr/files/sejeb.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/84348026990.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/buxabopusetok.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/tepasivegowalevoboxu.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/rototawijo.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/31205347565.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/zudotur.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/veritivakixenoniki.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/sufajenusumarapojabizome.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/974a8ce4fc0e94702ea006f5107a22ca/11857048799.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/46571125697.pdfIn PDF document text
    • https://profesa.net/userFilesfile/zilatolelodadifikogag.pdfIn PDF document text
    • http://grotech.in/userfiles/file/gajapijeze.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/xugirusubewiravisul.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/vapexen.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/1524500652.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5bb3307d5---16351157930.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/1091999537.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/56278416247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+open+app+from+push+notificationPDF 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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 10920 bytes
SHA-256: 59c07ea6dc103b3aab6c7d4bc0b12b6cdfd86ed21b971fad83ca717423e5a207
font_02_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 16984 bytes
SHA-256: d20796cd7eae61ff727cb534106a78ae77bed08d8d282344c39a1a02f3a7753e

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