Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d82d9570e436780…

MALICIOUS

PDF

75.4 KB Created: 2021-09-18 12:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9ab8a047d825bb2e352aa63fe5430c11 SHA-1: 0e358fb7e4730a5d7c9ef1a32626fe66f3852dfa SHA-256: 6d82d9570e4367806802c2b67995ce122259d513bd2c730445403854c0215a5c
134 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 and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

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 https://irlanc.ru/uplcv?utm_term=twilight+princess+gamecube+emulator PDF link annotation
    • https://myvideoclasses.com/ci/userfiles/files/72132530413.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/vixalexusapa.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/74673715034.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109131102316415.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/zufekadonipam.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/79377506536.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/muputinekexafuximo.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/fataxavekenuzobewo.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/jusawosofaki.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/wuruziburine.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/fezabiliviligam.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/38968206299.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/17721635245.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210912032931_0021h7.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/22247605602.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/76585178445.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210911183427.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/xajab.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/fiwig.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/98647784762.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/weriwikazuvitagemasavebop.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/negimixuvafoxadinimoliw.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/kewizawozadadofuwuto.pdfIn PDF document text
    • http://saktigroup.in/uploads/18120982778.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/magusonoxinavofiridoxis.pdfIn PDF document text
    • 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_off0000c157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC157 17544 bytes
SHA-256: 2cfb528ea9306dbe8f30ebac3c2cd9851d812ed3ca6f68d33cf234228a8cfc02
font_01_sfnt_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001066a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A 11112 bytes
SHA-256: 9c5afea656956b90eee2d1b45f04643f90fa12a7c209c51f5c0565ac5a41bc53