Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3e1fe896740b59…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 06:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f70f5a30018bd350f89fc08a953688df SHA-1: c7f26956cc44ab38cc31c433b4a280d3a4acaff1 SHA-256: 2b3e1fe896740b595e3f9c67d9a2d98990058b9437a48fb26cfee35e5ab12435
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed numerous external URLs embedded within the PDF, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3499

Heuristics 4

  • 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
  • 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://infrive.ru/uplcv?utm_term=android+studio+project+sdk+is+not+defined PDF link annotation
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/ranogejaxuvafitawud.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/vajawavifanorixokuwum.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/ribewewogisepid.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/11710351757.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/petagesalivifevovurufi.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/sobifevofenisamevu.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/3944518055.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/sikak.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210904181704.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/livinarodovunuseposonovem.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/54664546342.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/8578481576.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/57118776163.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/fuzoginosi.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/nibogijekifex.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/53332677688.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/14071483962.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/famapudalerofatoromarosog.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210913170705.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b23cf80dc9---puzovezixofiwu.pdfIn PDF document text
    • https://dcimx.com/files/92466268242.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/faladezoxakimefepivep.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/48095057117.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 17412 bytes
SHA-256: a75086a1ea556ff2716ac7c56ee5c3ef5330bdd719a73065ee5873f8b612fde3
font_01_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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