Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27501bd3d2db627…

MALICIOUS

PDF

74.8 KB Created: 2021-09-14 00:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1426d05a2b53e7848f0cd1c1e311dc6a SHA-1: 51ddc9ad316af2c90b014b85e4651aa7642aef7a SHA-256: e27501bd3d2db627a1444d41b8e2179a0ec641d489d54c278f47c90dd2ed09b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute malware or facilitate phishing. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://juncheng.tw/upload/files/jibomogegaretubewejin.pdf In PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/51415446521.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/vuwaxebimonokuvalu.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/10397243284.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/91777191071.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/lozavuponave.pdfIn PDF document text
    • https://mmtours.si/uploads/66247749541.pdfIn PDF document text
    • https://shunnasato.com/82900284285.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/98326728462.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109041842266732.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/50cf9ee6239942e6a35bd0892801160c/gekametelozod.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/17257073106.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/39019860207.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/67834074767.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/lorakajexoso.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/47091649149.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/26663453175.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/pagafake.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/fukakure.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/denoxalolup.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/damepovobagebava.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/89448927989.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301048d1f22---94660221094.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/50204298992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=battle+of+war+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_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 10524 bytes
SHA-256: 55d956e8048a49998c2e65ffcb7abb6d1ffdd109f99fadf962e9a07070d4bce8
font_01_sfnt_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 17872 bytes
SHA-256: 72e0633efea8bb02fb08f42c95ac04912e97760f920c3f7bff0b401b0ea5733a
font_02_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1