Malicious PDF — malware analysis report

Static analysis result for SHA-256 1617e4344da7cfab…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 18:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01218af42d7c042fc0ad970ad1bc7d12 SHA-1: 0be436e01341bedcbee602c538ca0ad44f989439 SHA-256: 1617e4344da7cfaba109d2bad36e112c3e5fcc97f86a0c7e0b06f04f572a5ef8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the PDF is designed to host many links, potentially to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=babumoshai+bandookbaaz+free+movie+download PDF link annotation
    • http://kechengchem.com/upload/files/56781511896.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/74762686715.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/lopisoxoroz.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-5/20210905070223234508.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/wibow.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/gipewuluxeduvobipufixases.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/nodapijoratilekokeraxu.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/tolekipivameju.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/70597026519.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/pofevu.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/89200898742.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/6526201471.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/pulovuriti.pdfIn PDF document text
    • https://kristinanamaste.eu/files/91009106603.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bfae55e28---joverabo.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/21578939302.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/gezifuxaxokiguzilaritona.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee3f272513---gutubonisedudez.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/visazupu.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/sufaxisoniwowogudozi.pdfIn PDF document text
    • http://skncn.com/u/files/maposukibuw.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/92144699372.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/39947156304.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/nurijamabuwukis.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/kupipokixazevugux.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_off0000b6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 16728 bytes
SHA-256: b377ff8a06d38bd0ed28e00c0097c89480fe84654aec8bf922b1c9020da6c573
font_02_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 11116 bytes
SHA-256: a3f9972e0c475d5314409fcd773930bfe96a790c0f61a1d6288d6be31367cefb