Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cfd2be4aa5f692…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 01:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed25adc7530d736717d7b54fb45e5496 SHA-1: 92f960de01f67639c292fb994b3518e697ec438d SHA-256: d8cfd2be4aa5f69257e5799c3b57dd4f1cf9db53b58ba78603cf4ce247da1bdf
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://ikima.fr/uploads/file/14597327230.pdf In PDF document text
    • http://www.serenissimaservizi.com/files/89470111431.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/nogedefowadak.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613f9de18b991---lanixipakix.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/xexof.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/92229105830.pdfIn PDF document text
    • http://aa-nusd.jp/lepoledepeselikopuxili.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/miwupekavujunikamakob.pdfIn macro / runtime command snippet
    • https://otterdisplay.com/userfiles/file/sanosetetebis.pdfIn macro / runtime command snippet
    • http://heorungminhphat.com/luutru/files/68509727073.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/piponuxajilijevesed.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/34620125727.pdfIn PDF document text
    • http://iphysiology.ru/upload/15538045004.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/gogujexu.pdfIn PDF document text
    • https://kueapem.com/contents/files/defejemegupojizej.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/genejivabojadamofevuduxak.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/99608645294.pdfIn PDF document text
    • https://alohasafaris.com/files/gipobarurovije.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/xoliruwawijet.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/wazagovejukolusipup.pdfIn PDF document text
    • https://preciseenergygroup.com/media/tubinewejapi.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/70277292691.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/vunobofeletavo.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/wikebesuxumixade.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8355f159719bcd8fcd7e34ca8dcbda72/xivekinuwamubaga.pdfIn PDF document text
    • http://aa-nusd.jp/lepolIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=app+to+sd+no+rootPDF 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_off0000c07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 9936 bytes
SHA-256: 58dba0f714212891cc94f7dba6b1aee2f0c959a7267862ea8917b365e4e5ccd0
font_02_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 18512 bytes
SHA-256: 9f90a5f415d12d2aaebcdd558559262420fad05c98ba62dd6e302e7426b746b4

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