Malicious PDF — malware analysis report

Static analysis result for SHA-256 c827513b9ab01f6f…

MALICIOUS

PDF

62.3 KB Created: 2021-09-25 03:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4562155e327d16621bb37778a8c3d4b0 SHA-1: 2726dff0a115bcb125c47e767573ab34db073985 SHA-256: c827513b9ab01f6f6ec7e15402c983a332a49ce4fe99cfda8fd56944e8f43a98
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests the document's primary purpose is to host a collection of links, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6429

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 http://pinzimoniofiumicino.eu/userfiles/files/sunitado.pdf In PDF document text
    • https://archielectronics.com/userfiles/files/zedarevutirenozovekiv.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/verumusadoza.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/85461384397.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/8209320826.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/77456656315.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/paxamumetazikesewe.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/27463163929.pdfIn PDF document text
    • https://endobible.com/userfiles/file/puwaleki.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/fukogu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5413e26d---1923778731.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/24751093744.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/26093292674.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/toromolupugogexemej.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/55397719481.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/99271284612.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/77706482081.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/galenifupediloxofikifex.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/69684621869.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/87395992821.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e56eae66ee---89134636315.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/6173872737.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/rapivi.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-15/20210915145642615642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=american+beauty+watch+online+fmoviesPDF link annotation
    • 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_off0000afbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBF 11088 bytes
SHA-256: 4a73817d352be9f31a1dbab2efc4f28b4a762558ad21a148d910d78ea226e11f
font_01_sfnt_off0000c983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC983 16648 bytes
SHA-256: f30cba9b2964447dfbee92672eba1c5514eca465975a05073e8ab4158616f195