Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9446f93b36db584…

MALICIOUS

PDF

73.7 KB Created: 2021-09-11 14:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9d3a4b60e969a1fa2b6504f7c03a7bd8 SHA-1: 9b542cb3949d2ac92b55b37200e96e3188be2ea0 SHA-256: f9446f93b36db584a8d87c804c11f5a0c35f349582bf3341abf31fd8639ec2ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. This behavior, combined with ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious content.

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://irlanc.ru/uplcv?utm_term=completing+the+square+video PDF link annotation
    • https://yourownadviser.com/ckfinder/userfiles/files/ripewejifoxavogutaneber.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161347dd6b2355---sorobutiwo.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/lesabapukazupesomefag.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/82154018751.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/23895991221.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210904_E33C13E1A6F965A0.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/xexotekexovaduxerorilepe.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210901131237706023ebo8i9b9s4nb.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/92083312560.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/50609725492.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/onq1ut6c7efkccu7nc5gea8v1g/75869960518.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/97601122631.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/50600366506.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210910_D550ED35AAE1EACB.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/borozemaginuloper.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/77015150788.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/budabi.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/8385657165.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312db42b4ea---zikijapuvodifezaxedes.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/pusuxe.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/rugoxabolo.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/xowanasonuxilox.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/77491695221.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/joxujaxumugixebode.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_off0000bcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 16848 bytes
SHA-256: d5973d4973aaa27b892c93493da370adc51b0dda2f4b3364c1b48b8d76cb4cfb
font_02_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 11184 bytes
SHA-256: 4b266cf98ed76ef5f6c04e34919df5559deb5f61962307dd3d77e378e7d0968d