Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af56750fbd9ee08…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 10:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80ac3edb7e3fd6ff733577de8dc611a1 SHA-1: 202d263f305c0c986fd1a358d4ce3ad500addf6d SHA-256: 6af56750fbd9ee086c5485134ea3a2e5a5534cc1e2d22778f267cd2b2ae4a2ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the ultimate destination. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/ninifuzatuwuguvu.pdf In PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/18511936358.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109131032554480.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/kotasebusajarelugo.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/67246304662.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/denosige.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/13652491405.pdfIn PDF document text
    • https://citronel.com/userfiles/files/sikivimopedonegogigaz.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/winewov.pdfIn PDF document text
    • http://getem.eu/files/file/vuweko.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/fikaxuwifusakas.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/pidowu.pdfIn PDF document text
    • http://asqcert.net/files/files/79259791746.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/85601952023.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326fb0e1ad2---pufevinemarula.pdfIn PDF document text
    • https://megashina24.ru/files/files/jukofi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d64be7d6---17437225430.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/xupapejivimogiziwe.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/ritupeto.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/tovijasob.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/wojexakuxer.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/piriwilizisos.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/81636060302.pdfIn PDF document text
    • http://orthopediedelft.eu/files/44579849048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+print+two+page+in+one+paperPDF 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_off0000d0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FC 16284 bytes
SHA-256: 9c9265e8b17e053e79b6eef6e69032c7ea4cd4b27b87e7440ec1ff99390db6fe
font_01_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 10288 bytes
SHA-256: fc65f05a07e7b567697bd3f5ed170347451d22dbb373c737b42c5e7749bf512a