Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb683ebe0156b892…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 10:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c773b1e70128b4927f7d7b90b0c61895 SHA-1: 34b5139b907661870522f87afe3bce15298e120d SHA-256: fb683ebe0156b892b54d41cbbf09e68d3da17c97dfaa14f6ef26908175f99151
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features numerous external URIs, including one flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

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://drafthe.ru/uplcv?utm_term=volume+review+worksheet PDF link annotation
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/71686508348.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/kirakesagipetikebigarogiz.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/13901356060.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/42761390510.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/dimeg.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/22650164105.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/12889331560.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/rurigowilokotiwuzopirilul.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/15365420826.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/61420692715.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/daxexozagasewazisidep.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a3b361ea---mexufuro.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/28953830193.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/39856186920.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/50978031154.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/djdcfe9t08788iagavqaje18h8/pudig.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///45907419377.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/65299022109.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210906_000330_6204.pdfIn PDF document text
    • http://myphamasia.net/upload/files/86669829175.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/99454968487.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/nozetamumirupinobunu.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_off0000d69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69C 10420 bytes
SHA-256: c4b17776bae8faee488af3744f7b73181c7c93a6dac75fe29b96019eaf46aecb
font_01_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 16944 bytes
SHA-256: dbd052e0324d7e754e00b32b989cf2975a5cfcc5e436ebce78ce73a2bf46b416
font_02_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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