Malicious PDF — malware analysis report

Static analysis result for SHA-256 932a35f0f702f9d7…

MALICIOUS

PDF

87.1 KB Created: 2021-09-12 13:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b10ca01fd91b7138ebc483c1647675d SHA-1: b4481350dcb3fc64c6cff58be27554673ce13468 SHA-256: 932a35f0f702f9d7120a22f6bd54cef189f543d092e2265d83b5fabbf9933df3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=gomovies+love+island PDF link annotation
    • https://tranduongauto.com/app/webroot/files/images/pages/files/buvakurapijudala.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/27926640592.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/54730689859.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/61408568250.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/16721369820.pdfIn PDF document text
    • http://samtle.net/ckupload/files/zoxawigewuberegujaruxuxu.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/68579147109.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb011b8e8---95423009607.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/7387228382.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/36419158849.pdfIn PDF document text
    • https://edgecs.com/documents/64945141659.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/61475716838.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puwofagatukuj.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/sixopipidared.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/23250421855.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210904_6B47AC53FC298CF8.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210906160617.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/tefofili.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/41627075549.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/fivejutezod.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/37595289584.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/sufenuzutinunogezururemi.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/41388133828.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/dobajokasekimipilojuzo.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/wajumibomazivij.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16138a8dac0a07---17205118365.pdfIn PDF document text
    • 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_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 18660 bytes
SHA-256: c1f3ee2402cc5b3c8cf7069c9038df3ad2e8b77188399b7efcd5eaa3dabf7dfe
font_01_sfnt_off00011f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001376f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376F 10316 bytes
SHA-256: a0d05a9d0a5def41aa1a1d19a331b0f6b0fea818a6c3017a81c63e81203b3103