Malicious PDF — malware analysis report

Static analysis result for SHA-256 428bb8b7ec4b9941…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 17:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1fb08f925e9b10c2adb1e049d7dbb95 SHA-1: 9f0ec19aadc0312d5bc8a5c911d91a1c88cd3970 SHA-256: 428bb8b7ec4b9941d240e14fa608ea9a3a3e6b6113483a2546b606ba7c23d97d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of many unknown reputation URLs suggests an attempt to direct users to potentially harmful sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://hopclickhospitality.com/scgtest/team-explore/uploads/files/jebutibefedo.pdf In PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/63468673226.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/bawiniwawufupene.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/13803292154.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/3314518764.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/65037992531.pdfIn PDF document text
    • http://homeopathyhk.com/files/78690083088.pdfIn PDF document text
    • https://rm-parketi.si/uploads/fekuzawasom.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/vibiwaxarimijoxim.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/zizibinarimobiwuxevunu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1293472aa---725011924.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/gobetodep.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/fabafubowafaxedofikot.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/xorariguwuzojifuxil.pdfIn PDF document text
    • http://plise.org/userfiles/file/safabisukanagir.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/60708817300.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/70937585933.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/kapezesoj.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/48450369062.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/merimiruzezuximuxe.pdfIn PDF document text
    • http://iviltra.lt/images/files/pavitol.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/gofigevesaduzomibolexuw.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/lebanojafukopopa.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/duzug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=steam+chrome+os+downloadPDF 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_off0000b161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 10704 bytes
SHA-256: bca2633d30d0517230bda5f93d7c63a19aaf21998beb792086e56632fb1d2119
font_02_sfnt_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 14676 bytes
SHA-256: 6362de47b8c8cd7152fa1ada1d97e61ee9c2d2b005fdbf55835307dc9a99a7a3

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