Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7888fc201d21a4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 00:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db4fc5c4c70013ca7744eba11d53f9db SHA-1: f68159694f350db10bdde692ebf15620474f8b71 SHA-256: 6c7888fc201d21a4c4fdef286e069468e0ea5da78897db327006616f18c53444
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file utilizes numerous disposable domains and SEO-like URL parameters to host what appear to be other PDF documents, suggesting a link farm or download lure. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate potential exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/011625267080.pdf In PDF document text
    • http://ahkjt.com/upfile/file/tixirokokezivuzemefizew.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/51914266571.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/fudomojenuxumagipuji.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/34718817876.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/60507578128.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161349aed1580f---namusopixemugaposepumubu.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///86676117541.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/20784177906.pdfIn PDF document text
    • http://lgassociates.in/uploads/sewimes.pdfIn PDF document text
    • https://theurbanthinktank.com/files/32265520879.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/853d7bae413af614c860f4a41f481402/22343869124.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/bolajopekoda.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/novogejaferuzuzemujufogu.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/41476875557.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/30487678020.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/53588514348.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/91668989091.pdfIn PDF document text
    • https://777mto.info/contents/files/xenuvemufedawobabef.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109030033584103.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/21581047933.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/50614566072.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/19464300626.pdfIn PDF document text
    • http://kme-kme.cz/files/file/rakukaneliluzidipajese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kubernetes+up+and+running+2nd+edition+pdf+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_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 18808 bytes
SHA-256: 4ff028375656e784d2373e28d72f3f899aa5a6ddc528f1ffdd3ed2aa90e2e4f6
font_01_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 11112 bytes
SHA-256: 877b2a5de6af7ab5d23175ea94c66f74b11587b6e60130200c777035e5ea08f2