Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7402b8b30d025ad…

MALICIOUS

PDF

76.0 KB Created: 2021-10-24 18:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1b725151ec4d745069d61e2e64ef5f3f SHA-1: 33be893a196ae6b6ee1b848426178a3486d9943a SHA-256: d7402b8b30d025ad00af3539434f990495a0affeca04b3d4cadaad0813acb9ab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://rnralpha.cz/res/file/zozirumiku.pdf In PDF document text
    • http://yokohama-model.com/userfiles/files/fugiditufaziroguvep.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/30716213175.pdfIn PDF document text
    • https://architektor.ru/uploads/file/kujejubuzerinagaraf.pdfIn PDF document text
    • http://raczcsalad.hu/files/71117470068.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/43861599884.pdfIn PDF document text
    • http://centrons.com/uploaded/file/4439734136162bd4943363.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/051556131281.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/42264759395.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-24/20210924152706382220.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/tivus.pdfIn PDF document text
    • http://vasudevindustries.com/userfiles/file/kuvomer.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/5600348122.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/vugesovuri.pdfIn PDF document text
    • http://toptenstudy.com/upload/files/BodyFile__6156E28BF0A40.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/xonot.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/48853297030.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/rinuvatoxetiwovizoxamaxik.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/xogudafawabovewelovabade.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/80497483860.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/34849175734.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/9lqoqdrd0g54hldl8gpfpe3ut6/jomelegoganefame.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/diremiwapipavapopimes.pdfIn PDF document text
    • http://xn--90aatbabxd8ae1kf.xn--p1ai/files/95898604386.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/vItLtdF7Pec/uplcv?utm_term=data+warehouse+fundamentals+for+beginners+free+downloadPDF 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_off0000c42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42E 11128 bytes
SHA-256: eb2c16fb9a173ca2b3dcff7e77b137cf55f9c430e9930d6a8dfaf0b73cfae54b
font_01_sfnt_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 17200 bytes
SHA-256: e394ed1fce1dd5dcbe3817348c480d511254e630cfa98f4686cb725d15ae0972
font_02_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1