Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f389cf1f1fa086…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 12:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b263ebac7dceba408d8d5bbc7cb20573 SHA-1: e12d999e65142c7b0f060c4305eec7a78686cc0f SHA-256: d8f389cf1f1fa086a9da63dce9df089ad30b13f647af7e1b32ddeeebb8a0b473
134 Risk Score

Malware Insights

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

The PDF_JS heuristic indicates the presence of embedded JavaScript, which is a common technique for executing malicious actions within PDF documents. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, despite some being marked as benign, point towards a phishing or malware distribution scheme, likely initiated by the JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bestcoloringpages.com/userfiles/file/90906319132.pdf In PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909161338.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/33018925076.pdfIn PDF document text
    • https://inks.bg/userfiles/file/4997003426.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16309359462147110524.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/binix.pdfIn PDF document text
    • https://lapakunited.com/contents/files/22025354441.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/govibijiporo.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/70284059363.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/wevixafibevajiwujuduvodiz.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/gevejoxesaraged.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///diminarizafawolaluk.pdfIn PDF document text
    • http://splogservice.ru/content/files/tefapazinapajetazunum.pdfIn PDF document text
    • http://kco.su/userfiles/file/56672916946.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/lunijanofugazak.pdfIn PDF document text
    • http://merydian.pl/nowymerydian/userfiles/file/tumisiturejogijabo.pdfIn PDF document text
    • http://ippon.lv/uploads/File/sawuzafogexazinumakizenek.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/52037710750.pdfIn PDF document text
    • http://theponghop.com/upload/files/43598299733.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/51811398574.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/64711144642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=deleted+files+recovery+android+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_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 17976 bytes
SHA-256: ffa431c693066e4eaa699884b2128f703eb5e7ab43dcfd3f3c436c196f89ba4d
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 10796 bytes
SHA-256: a5cc688a51a617c76e40ff628d570f6642f890687be88cc9eeb7abb83281c623
font_02_sfnt_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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