Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f009f98c8b33657…

MALICIOUS

PDF

71.2 KB Created: 2021-10-04 06:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4c58f0eef28733d791bbc5f6d1dc5df0 SHA-1: 61345ab630a0b802c3dccbbe01f30972100ed4b5 SHA-256: 8f009f98c8b336576bac63358f3672fc8bb1978cbf2de6d4f0e566e8973fc8dd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to a link farm on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://officialbacknumber.com/editor_up/9366312885.pdf In PDF document text
    • http://massarentearchitettura.com/userfiles/files/kimudaxaxokerux.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb976ccdd---lopagusumolakoxeposa.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/dd59f013cbd7c9e272e86c93aef7610e/6077911695.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/42917292102.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/pajigukuwopi.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/melowajo.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/71217736190.pdfIn PDF document text
    • https://topupdana.com/contents/files/4260115245.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/85679441408.pdfIn PDF document text
    • https://jjpremiers.com/files/84010786623.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/gupofesigada.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/97253002943.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/91471331415.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/sesuxa.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/96508088993.pdfIn PDF document text
    • http://baove247.org/upload/files/29281776498.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/firosemejam.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/53234455368.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/72292739734.pdfIn PDF document text
    • http://gysanya.com/upload/file/211003205206096300m2zdfm18nntm.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161386d191d32d---65739419630.pdfIn PDF document text
    • http://pjteam.hu/uploads/88932514507.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/milegukiwofebowunatoge.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/64759042470.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/97861479552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=when+to+use+hay+in+spanishPDF 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_off0000b50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50D 10412 bytes
SHA-256: db35c8c08748f1d84cf3b02a642ceb81b3dbbb75f4524cb2fb9dda02d26e4ec2
font_01_sfnt_off0000ccae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 16668 bytes
SHA-256: 2a846f440ade4836157a72d1858733b63b5f0ef8823ab85396eaa719d5c8ad5f