Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6670b868173eebf…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 05:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 82c5164579835abb6daccb894b7c6e1d SHA-1: ad31afdb41de8f6a3bc23db9b9ef32f1ca645cd9 SHA-256: e6670b868173eebfb951823b09219b8b780e801ce97908aae2019eec1cf5ac03
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. The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a link farm designed for malicious purposes. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is used as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.romanschatztruhe.de/img/files/dazesudozegujirat.pdf In PDF document text
    • http://sial.pl/galeria/file/70156265949.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/gozegipesekun.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/rakusasan.pdfIn PDF document text
    • http://congluc.com/upload/files/sazirilorenajigu.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/65078875849.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/zexutalewurawamigax.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/tololivaruwuxafa.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/79082424844.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/lodugefezegofed.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/89345395410.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/52370892122.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210905093548746102my47j3navv6n.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/48627164056.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/rakuserimosekoxilo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/dodopepefebije.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c24a32454---28950989846.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9f5a95819---sopiwirevulugabuwe.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/39101643269.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/mokube.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/ragodojamevoguzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=whatsapp+chat+history+from+android+to+iphonePDF 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_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 17636 bytes
SHA-256: 927c3599dc4d86e8bd8dead0669177a42054579271d5f34bbb68eed704b159dd
font_02_sfnt_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 10948 bytes
SHA-256: 64cd7ee14180d79ce10212f4ffa29613499b27c55520b2494f6cf080a4b899d2

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