Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c5c4f1d09d8575…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 15:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 857327b31430d13fe3fbc7f417c0b71c SHA-1: 1a9a7905338d022a90b79a564d6fbdadba46e001 SHA-256: 80c5c4f1d09d85752bc3cb82c4359f092189669da00f70c0b4a652b7baef7f81
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.dogwoodagility.nl/ckfinder/userfiles/files/25383044159.pdf In PDF document text
    • https://alzubidi.com/userfiles/files/xiteselotuwozoxa.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/41635548911.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/semipo.pdfIn PDF document text
    • http://foodchemsino.com/d/files/dupokonariduvo.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xigifapewekunab.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/69796148179.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/wenigo.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/57825341892.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/bujupedaxus.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/2069740638.pdfIn PDF document text
    • http://mega.kz/media/upload/files/roxotofavaxiwi.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/wozagivifulu.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/renefetarafuwozizonepog.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/somoxibakuwufib.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7d8b6952---37795530241.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/16718890296.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/63588048279.pdfIn PDF document text
    • https://mackbeks.com/files/file/89190633858.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/pupipopesenisudise.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/36317955da70f6f9b30f739698249c91/jifiminujaxesaxis.pdfIn PDF document text
    • http://mastervin.ru/files/file/wigoxijazafefefuwufufom.pdfIn PDF document text
    • http://scro.ru/pic/file/54566902784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=doujinshi+apk+latest+versionPDF 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_off0000d6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EF 17960 bytes
SHA-256: 6998c3cbe1d3b76bce1ae2fa925e2e612064f4025093946ad40dbdc2d9d4f29e
font_01_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 10740 bytes
SHA-256: 1830c5778560ed1e6130b7b479432f10269733e89a3af9eb83a053d37835cdcb
font_02_sfnt_off00011e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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