Malicious PDF — malware analysis report

Static analysis result for SHA-256 f395406566dd8720…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 07:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 664974bfb8401965cf05987a959b888d SHA-1: 824bc67521f3510ca727b76510b44a40b0a8464d SHA-256: f395406566dd8720dcd629dc7bf7926acf695279b9a3ba7657fc93f977e1f816
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF viewers and delivering malicious content. The presence of numerous external URIs, many pointing to PDF files on distinct hosts, suggests a link farm or redirection mechanism designed to lead users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://299-45.com/CKEdit/upload/files/gerepelu.pdf In PDF document text
    • https://flavio-tonon.it/public/file/51207925079.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/gonusajatugegatafemupanar.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/beterajuvofufi.pdfIn PDF document text
    • http://asja.ua/userfiles/file/veweto.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/63726745001.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/77627757690.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/nikabizokem.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/82740093776.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/lenitatasaveroxejuxiz.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/71124353311.pdfIn PDF document text
    • http://exima.kr/userData/board/file/belak.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/bujed.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/50002639199.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/gegazuxetiben.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/47829757110.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/989821846.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/84462116832.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/ferufaretagopanexu.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161367687eb6e7---69285353502.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/dumitoxuwak.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/11656523051.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/rekuzoxupobofalem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=stick+war+legacy+hack+3+apk+mod+999+armyPDF 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_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 11396 bytes
SHA-256: f305497966e2b94e845f4fb0138e2822edb44c66a88287294a1c3aaa699ecd6c
font_01_sfnt_off0000fbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB7 20608 bytes
SHA-256: dd1f0f190350760d9e675c067826d80e618c152a431d35c116479a22e813b59d
font_02_sfnt_off00013187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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