Malicious PDF — malware analysis report

Static analysis result for SHA-256 9959ec41bc7b95d6…

MALICIOUS

PDF

87.0 KB Created: 2021-09-11 07:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45a2c53a7495bf82a8d9684c699d3d28 SHA-1: 58ce84dff52ae6e1bb909801847cf4ef3a00e04e SHA-256: 9959ec41bc7b95d6b6a1587eaf5614b9224fbba724ab1f446a790c6efb4c3b2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains 33 embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the structure and numerous external links strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://nomylo.ru/uplcv?utm_term=games+in+offline PDF link annotation
    • http://sendedianqi.com/upload_fck/file/2021-9-3/20210903155502950386.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fojowavefurimitem.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/rotoxixifukugesumaputew.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/loxofuda.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/73570319174.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/12802481310.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/wusewiz.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/56245084422.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5d4879c6---12779880419.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/66649836657.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/rewujabupivujezatoze.pdfIn PDF document text
    • https://hobbypet.cz/files/file/82449040750.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/xusarirejavakonatodu.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zirenexiwowivurukolulol.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320cd435ba1---novijozubekewenemewitewaw.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/lizipipu.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/tazafiguwoxu.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/45592571303.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/87713569837.pdfIn PDF document text
    • http://charivne.info/images/file/kuwadoferomeruveraxakup.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/zenawe.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/39862838373.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/solalopok.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_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 10216 bytes
SHA-256: 421791753938b7a518a4ce933aa2196a751daaaddda655c89b5a704da3f79722
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 17376 bytes
SHA-256: e1ef6c614f5b756c9c50aaf762313ad76b059cbfc270ecc6b2c413ba2abbaad8
font_02_sfnt_off00013652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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