Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f3dcbf59b5d690…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 14:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9104f1230fec7723aabe98e07e603e8 SHA-1: 2953ffb50190eb499b765fa7fb2b2dd64bca86ab SHA-256: 41f3dcbf59b5d6904070f3fd37ff0e2d49269b48cbc647a11ac82d44d58264de
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 heuristics indicating it functions as a link farm. Multiple external URIs are present, suggesting an attempt to redirect users to malicious sites for phishing or malware downloads. The PDF structure and embedded links are consistent with a phishing lure.

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 https://pixomot.ru/uplcv?utm_term=the+way+of+the+superior+man+by+david+deida+pdf PDF link annotation
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/75793622055.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/sawikimevosus.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/petegedemokitiwijezux.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109092054031935.pdfIn PDF document text
    • http://whatdwellswithin.com/file/11441506728.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/93063241776.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/xikenufokowa.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/wemamolud.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/13799574061.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/xubipidurugosi.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///37291454781.pdfIn PDF document text
    • http://htwy.com/upload/file/pininipibizasunetip.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/acf07085d8466e0bdefcfa4e6a915789/90414127009.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/36889557314.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161342cd96bdcc---sutumim.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/dedikezabisafugawaneki.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/14324261177.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/kerenozonuwur.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/pufuvogor.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/17525220138.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/34133921843.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/79537041575.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/melebaxalizetezobov.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/tikezur.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wumumep.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_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 17948 bytes
SHA-256: 55656839563dab7861c1a18012de8c8809f5fe2dea7554a05f0e9aae215dccd3
font_02_sfnt_off000128ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EA 11184 bytes
SHA-256: 584a54f7f1d7f53e0582aa174805f5b87b898b051931dc128830d748e14dc85d