Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdb8f579cdd92a3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 11:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff1de19a219c2c3119ab6fbc4e7ec06f SHA-1: b822cdb9cd6913cbacfd8329c6e4232ba188e11f SHA-256: cfdb8f579cdd92a313fc56a9ddab4e805b8a2fb372cd0169ac35a6693744802e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs pointing to potentially malicious content, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a link farm designed to obscure the true destination. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://halkapsikoloji.net/userfiles/file/puwiseronif.pdf In PDF document text
    • http://dentalweek.eu/userfiles/files/76542220480.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/40157881433.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/38943274608.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161409006238f6---95322100092.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/gusigoxudo.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/lemagonunujab.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/nuxomiwegafudodakebasij.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/vuburivugisexegorek.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/mozuzegefawijekapolepa.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/toxizaronisugadojukega.pdfIn PDF document text
    • http://belovosushi.ru/files/fekisex.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/rujinuzabilixa.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/1078063908.pdfIn PDF document text
    • http://axwelindia.com/uploads/97107943277.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614050a3536ed---forefijazibodomaviwimeva.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/45003019477.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/94643302027.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/71657231010.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/18331809589.pdfIn PDF document text
    • https://campermagazine.tv/public/file/zirazu.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/gekufetamemut.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/xuwakuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+live+cricket+appPDF 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_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 17320 bytes
SHA-256: ed30f41f6668c29f2200ba5f9c3e975b649798dcca8b797248b3b801a9ccf168
font_02_sfnt_off00012247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12247 10108 bytes
SHA-256: 612d356be1acdf2ec275517f2de3668df3f707b49eab08a7c88f28a24e1d41c1

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