Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe92495ed22200b…

MALICIOUS

PDF

74.0 KB Created: 2021-09-26 02:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3785c69787305f76c60ccb90b85e7042 SHA-1: f5a700edb8c7dba51da3e6b765ac263117bae7c0 SHA-256: fbe92495ed22200b53c912e07fd69b4026994623f3845c7b5a7671d803479fd3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also includes numerous external URIs, many of which point to PDFs hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://architettorobertafasola.eu/userfiles/files/wilejamofibulo.pdf In PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/rotafufofe.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210926_A5ADC7F1C0C33826.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/95640665663.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/18933893718.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/75983544303.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/tokuwamutixe.pdfIn PDF document text
    • https://partetesal.ir/data/file/ribekujodobiluporemosigok.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/lenuzitixo.pdfIn PDF document text
    • https://flyags.com/editorResources/file///kikaxalojabivazo.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/jozogojedito.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/muvilikadoruv.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/58399368870.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/katoxox.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/55957413998.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/wumiz.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/31787226964.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa02a4f67d---rasimimodawuwavegot.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd7541c3679ae442a78fcfa28578a891/23204310520.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/12058180341.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/fibus.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/pudat.pdfIn PDF document text
    • http://boldogelet.hu/media/10621889620.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/80317301827.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/29724120989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=importing+contacts+from+icloud+to+androidPDF 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_off0000b843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB843 18940 bytes
SHA-256: d4409a49c45ad1ca3c9a310544bd76587a23cacf7f4e9583e78e9a1cd9e90afc
font_01_sfnt_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 10884 bytes
SHA-256: aa53f1edcd2b1f3aa38be1ebc64de1c94bd908d9a9fbcad9236253125d2ca31d