Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ab3bbc73736532…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 08:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 01902bcb28af82c922f10c60d65de7e2 SHA-1: 127c591b7c13734be2bd0ac6f146a46ff4489664 SHA-256: 28ab3bbc73736532868795fe91f4a5786da8a7b643f4467c49a192cfb4ded7ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/24495789660.pdf In PDF document text
    • http://pune-india.info/userfiles/file/voradewumusapi.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/24218179940.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/46805921942.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/bifuvotekasidukubudar.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/83233924733.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/84175340220.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/lobeluxodoxazupasun.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/tukejifovisuwezaz.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/96371259153.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/vinerilid.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/viponera.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/rikaziv.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/50966925557.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/37343936202.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/59829418342.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/vagexukakabafirivona.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/63753950014.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/809790020.pdfIn PDF document text
    • https://fishuntpesca.it/file/misewibizesugipef.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/26776525165.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/wenalisis.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/jolewa.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/26476481075.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/saxude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=crash+of+cars+hack+mod+apkPDF 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_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 17832 bytes
SHA-256: 2dbb17235246b5335ac1f6f6c393ea4271b2d8e4bc820e0dea624f1ae247e21d
font_01_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 10536 bytes
SHA-256: bb7dc4c023c20248c958a22a3de29327b9bbe48e05ca9e3fb4fc21816a7b2c4c
font_02_sfnt_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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