Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd226d141cd356ed…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 22:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69107fe86c4f23f9cfc946c64f529807 SHA-1: 0c77f70f59645d702290ec9f8d6911892aae03b2 SHA-256: cd226d141cd356edfeac669aac5a2b0691536492a629a2bf227ffba028213ea8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicates maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to host many links, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=scanning+qr+codes+with+android+phone PDF link annotation
    • https://apc-algercentre.dz/ckfinder/userfiles/files/64767346419.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/39554491197.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/jabitarefijatosufunaje.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/derapatovadivirosinuta.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/54117706325.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/68103547530.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/fezebewezedujoker.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16137b522e5f48---61025157989.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/darupodepurelanabekivoxup.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/jipufijerovotexugepitil.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/tibatokiwomuj.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/71601989563.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/vomefiluvidu.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/69783257757.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/galalebogiv.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1244ta5534js1l5io4li39akt9/57291672580.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/47646664547.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/45013787710.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/kiviraduxutimut.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/sarapofisomelave.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/91740360494.pdfIn PDF document text
    • https://reha.bg/content/upload/file/vesotuba.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/dukoruserakajadikivogiwu.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/guwikedotupigixajidaxezar.pdfIn PDF document text
    • https://beautydent.hu/editor_up/45221551048.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_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 18436 bytes
SHA-256: 01fa0ca762cf2352b9c8884cabb5e57dcd700f9776b1c3515d82c1a1a3b422e7
font_01_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 11056 bytes
SHA-256: ac198f07406fd0100e04ed95ac9a5f4ffe95abff1a9acdf4f595e0bf48af47f6
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1