Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7daf3206ff5bde5…

MALICIOUS

PDF

72.6 KB Created: 2021-09-27 05:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0aa8fb63b342575eb20ea0a023018c4f SHA-1: 592a25a393e69ec7e12343da07279685e60eeff7 SHA-256: a7daf3206ff5bde513de6e1c6086ac31db2a5fcdc90c346308035a2d9bf06dd9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to host numerous links, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=crashed+k+bromberg+read+online PDF link annotation
    • http://sgrappresentanze.eu/userfiles/files/wosasegafamoworazeg.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/78761579670.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/84879385146.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/89286711565.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/jufas.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/40011986351.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614715579794a---vivodukufimaroxeginudi.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/wamidamasilum.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/zewidivowu.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/fugarifilerepilufijabelix.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210925_151113.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/563380303.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/18776523295.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/kovorokizarup.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/tuvajumuvu.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210922145807.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/duzenudabepolomufiwuj.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/7480789470.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/17530106360.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/26549709997.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/25866169827.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/37000763083.pdfIn PDF document text
    • 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_off0000b3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F7 10860 bytes
SHA-256: 0f270d0f471e58d575ded02585718f8393149fcb5d13a5e66baf13a508552cc9
font_01_sfnt_off0000cc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8C 18092 bytes
SHA-256: 19aefbf708663d917e7ddc9aa27c26968fc810db499fd114aa422f619713e579
font_02_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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