Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c40ed86e164e542…

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 22:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 950cba1f7d9f0bda1c766a1244e013d4 SHA-1: 693f69d2bea59391bb51085f8dc3d9c2d4337b7f SHA-256: 4c40ed86e164e542abad263d7e5468bdb562a5b34e12f946328470113dafc264
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8966

Heuristics 5

  • 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
  • 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://gbagencement.fr/uploads/file/56908893582.pdf In PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/vawixoranogowuxurudedozik.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/3425152493.pdfIn PDF document text
    • http://pjteam.hu/uploads/xevesovuluwaviroze.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/78657036327.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/33421908820.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905071250617542.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/vijuzomez.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/76901408019.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/vurus.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/duwirupodeneti.pdfIn PDF document text
    • https://polytex.de/sites/default/files/40562567472.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109060045267992.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/xubusinonudupimikalifaza.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/kakorubulovora.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/pajukevafimadiv.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ef0acc187---biwewizowego.pdfIn PDF document text
    • https://banghenails.com/upload/file/83902408531.pdfIn PDF document text
    • http://exima.kr/userData/board/file/bopufe.pdfIn PDF document text
    • http://metzlerranch.com/userimages/jalipijukulozajaridit.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090809172173499.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/jozirizazomadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+pdf+mergePDF link annotation
    • 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_off0000ccb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 16864 bytes
SHA-256: d59fdff8cee31274300d40f621eacf69672f66bd69d534c7df5febf3453e3ae1
font_02_sfnt_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 10348 bytes
SHA-256: 2d698486d437a019f0c9b4346066f204c29af7b23dd9ec5f27ec6ec6b798b531

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