Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bcd66fc796c153…

MALICIOUS

PDF

86.2 KB Created: 2021-09-11 03:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 007b6f4286f31fca41c0c72e5f6ed2b3 SHA-1: 67726eddd593f0bcef38732cd898b4aac1185fbe SHA-256: e7bcd66fc796c15305a57bbf70803e2fc07ed37eeb3a25ed2fe6b8cfdfa38afd
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users to potentially malicious content, such as 'picsart cracked apk free download'. The presence of a download button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=picsart+cracked+apk+free+download PDF link annotation
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edc63cf4b7---jafixamu.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/96247999434.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/78651632361.pdfIn PDF document text
    • http://nature-revive.org/files/file/4230192567.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16137d96b096a9---24441049653.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/nexijomajofufixofus.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/mazenapakirajez.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/sepuxewebelorixuvubisitob.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/baxavawanokugezanazuwuzoj.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/mitatewumuwogotefapap.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/69123108787.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/luwugudemenidugixonaner.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/45529709243.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/33055699439.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/jupifufekunilomuxufu.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/bigurukesufesopunawumab.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/24467081590.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/rupisesosuzupizigir.pdfIn PDF document text
    • https://swiz.eu/files/editor/merapesigowe.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109081054042989.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/12348858183.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/46414802577.pdfIn PDF document text
    • https://alpinashop.bg/files/wexojuf.pdfIn PDF document text
    • http://c-six.it/userfiles/files/25103977632.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/31453451906.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_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 17412 bytes
SHA-256: ae25c5917fcf96a162ad9906f8bf37a9076f721efbe0a6a1ccfb739bea4c3499
font_01_sfnt_off00011959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 10792 bytes
SHA-256: c7582efc7dd8633c12d35c127099311521de145c465f48b33e0c3b87cacfdecc
font_02_sfnt_off0001326b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1