Malicious PDF — malware analysis report

Static analysis result for SHA-256 202d834398ee2ca3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 14:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d646a1c2e2c12e5f5092b00587308a22 SHA-1: c160d37d8c5dd3ac59dbbc0df05bb8b9611d6263 SHA-256: 202d834398ee2ca3446c670c5ba8975f496b6fb503addd959238a8e32692f90a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of urgency lures further supports this, indicating the document's content is designed to prompt immediate user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=vmix+pro+apk+unlocked PDF link annotation
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/64225868802.pdfIn PDF document text
    • https://grancom.by/upload/docs/mepuwuxowavikejevifipo.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/pixuvawekedaponafixorukeb.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210912083129.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://tessuno.com/upload/files/613690a48362e.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/79383809983.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/23035730755.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/55755671962.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/13175084804.pdfIn PDF document text
    • http://hak-al.com/resimler/files/31045047779.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/kotoluvorim.pdfIn PDF document text
    • http://www.pvvc.cz/files/xokizaw.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/lidebivov.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/wetapofako.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/midatukepututiz.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/tatemasozumenej.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132f7c4d12ba---wazatewomoxavawifabobu.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/gogejumawokuwisapeturosi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2029d5c3---63631073247.pdfIn PDF document text
    • https://magatek.com/documents/file/16395264340.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_off0000d3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BA 20940 bytes
SHA-256: 7a73fde6c3f1fb7adb04d74ceeba65df165b1ad9ffd69671716c65816bf3071b
font_01_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 10672 bytes
SHA-256: fe9e7d6f6ed17f428e810fa8cba6deae0e97a172611ae37e84ffbc97284eaa68
font_02_sfnt_off000121ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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