Malicious PDF — malware analysis report

Static analysis result for SHA-256 994d4d3c91427e42…

MALICIOUS

PDF

69.0 KB Created: 2021-10-12 03:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b76829e9881d4a5e87dced024f23af6c SHA-1: 77a3d3180a9517b81030ae083daebc45318ba9a5 SHA-256: 994d4d3c91427e42efe41c6d8e89b5f3dafbbd9365682e7d65835719a503caed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on various domains, with a significant number of these links pointing to domains flagged as disposable hosting. One heuristic specifically identifies the PDF as a link farm designed to distribute malicious content. The presence of a PDF_RANDOM_URL_LINK heuristic further suggests an attempt to distribute malware via a generated URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/gamukolero.pdf In PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/resigileletitomumusek.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/64950890237.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/ziratuxaw.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/paredimanikevoze.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/xuvekofa.pdfIn PDF document text
    • https://qkon.ca/images/file/68003366568.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/23325801183.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/baxulajejasijojizoz.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/81157081197.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109110446188478.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/39617898277.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/mujuso.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/99705483655.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/xubonadolurukimaluf.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161386c1c75e5c---xotowijo.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109151837034657.pdfIn PDF document text
    • https://granitnet.hu/editor_up/wagimapa.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210930_195902.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/kuxagaza.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/zowezemepof.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021925213248951.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/rumuravuzesemuwibumiweb.pdfIn PDF document text
    • http://aztkgb.love-mrt.com/upload/files/murozunanuto.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/u-9XGpgKpwY/uplcv?utm_term=small+4+wheel+drive+vehiclesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 10620 bytes
SHA-256: bffb80f574213e179bc3afd4f94fa2d175b7efd3a923770d687b7c6ac6717d98

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