Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd26b3264260c3a…

MALICIOUS

PDF

73.0 KB Created: 2021-09-21 06:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 223fdffc4e98ec93c3f0bf395c50be1d SHA-1: ec5c653d06aadfe28c948f07b0bd57720d9dde20 SHA-256: ddd26b3264260c3aea4e1c6aeed1e67f032f915be222d02c28f95c9108a6277d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it is a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to other PDFs, suggesting a multi-stage download or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://next-engineering.com/userfiles/files/tovaxes.pdf In PDF document text
    • http://weingut-suppan.at/files/kixeradez.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/pufuvajunoluwidoza.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/mepojijesebeminomurin.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/wolefexo.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/mabun.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/4747211712.pdfIn PDF document text
    • https://renetravel.ro/images/files/kizanalusapudi.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/4502898477.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614921c25294a---rewurevofenabumefobobajo.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/52836540083.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/87484786977.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2d61a0470c96f6f82b8158645bdf3ef0/leworobisebobof.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/tomolepudumego.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/3451237468.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/jajabonusototokup.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/17693981322.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/vuwefavavegipon.pdfIn PDF document text
    • https://podimercrm.com/img/files/13506934686.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/43167592594.pdfIn PDF document text
    • https://adium.ru/userfiles/file/luxokesowujinilamuki.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/37080618892.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/nobakalugufobiwifafozog.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/nigivineremuxal.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/19024948469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=content+authority+androidPDF 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_off0000bf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF48 15460 bytes
SHA-256: f51372d27bcc6832215f74d747902d6ecfd4aa034234f7c320dc5a246d28652d
font_01_sfnt_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 10376 bytes
SHA-256: 4ad4fbb22cbce8f5988d58b320f5fdb0f13ca4c970f0fe13f5d8f34fcfc434d3