Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f27350c14468b90…

MALICIOUS

PDF

71.3 KB Created: 2021-09-24 09:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aa72b0f11d9c570772c18754da09b88c SHA-1: 5f2cac26a585506f3922fd84511b762890c5d9f5 SHA-256: 8f27350c14468b90b3210bac37c7a19acdf0aba86c9af1ef450b3b65b474462f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://hemeringen.de/ckeditor_ablage/userfiles/files/fuxotupasexofevibofaluxox.pdf In PDF document text
    • http://kursadowicz.pl/Upload/file/56631405179.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/bexutorujuwejesud.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/duvawazepoxonigaku.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/xadebizunezogasup.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/55504014992.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/keboxawamija.pdfIn PDF document text
    • http://hmed.vn/upload/files/zapatevulufowisosixu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/f67904449b921f7dbe04143009fbb655/legufetuwobizadonumiwud.pdfIn PDF document text
    • http://52963566.com/upload/file/202109190344214271.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/zakijetixuzida.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/nubexabur.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/69000310582.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/nomujuzovitemuximek.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/78659826782.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/32855904079.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/66447156535.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/vipubutuzexonofemilijug.pdfIn PDF document text
    • http://sun-tes.ru/files/file/bikojuba.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/tafifesefolawepid.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345aba0a51d---99577469633.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/duzawotu.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/36202136335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=gta+5+xbox+360+cheat+codes+numbersPDF 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_off0000b5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBB 15184 bytes
SHA-256: 9d94d8896c96cfc6f180e06ea857caf34d3c806e17eab0b09bdea4a099414f28
font_02_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 11472 bytes
SHA-256: 1cadbb67d7052bad800c51581cf7d5f2cd99ac981e2fd60e350966a48a15319f

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