Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8f6453b12cf702…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 14:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 74f09777b592aa6cea6c542ba0b83c7d SHA-1: 9886821d0594af45fe1927ad728554806623a636 SHA-256: dd8f6453b12cf702a086cbe259087160f2d4733ec6f66cce1574382bca50613b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many of which point to disposable domains and are structured as a link farm, indicating a probable attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure suggest this document is designed to facilitate phishing or malware distribution.

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://garglob.ru/uplcv?utm_term=thanos+live+wallpaper PDF link annotation
    • http://etkindenetim.com/resimler/files/4516761622.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/wozobotitirapuxazemisef.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/nojazejezosaj.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/difofusikoxefuxobanonelin.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/59247729733.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/zefewumemirafafo.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/xubufuwidaziw.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/sipururosodukiwaji.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/visozojifagogogalojevivup.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/67380712113.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/fixofijefudosa.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/namelexodipafewoxim.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210902_1F670DB56757E6FB.pdfIn PDF document text
    • http://ausafe.net/images/art/files/lategidosarejavupijugun.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/poteputusamofudu.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091603444537.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345b1b51862---simegogemidetuwasanufeza.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/jufamijirivojid.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/39813183266.pdfIn PDF document text
    • http://alltechsro.cz/files/zisimawizabixuvexeluwu.pdfIn PDF document text
    • http://alcantara.cz/data/file/sufijofimiza.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/41174495578.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/fesibibiwewizuvikosixaso.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/fufewezewigat.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_off0000c1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D0 16884 bytes
SHA-256: 45cd50622466aab569aaf19c8de5b4b11d2e01c6c65c4e6869086865b8fb2c69
font_01_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 10364 bytes
SHA-256: c024afd64c7c28b469f2c29afa18421343a1d4f630233e1ab5591489147ca174