Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c6b59b96d37ca0…

MALICIOUS

PDF

98.9 KB Created: 2021-09-19 17:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05c0f462ab14a5ec6d6d90d7f0667177 SHA-1: 8ceeb0170d149958fa9bdec27ccd9334d7948aa0 SHA-256: e7c6b59b96d37ca0febc3b87b2bc2da3e0bf24ea99d99ccf1200c60dc734f1c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://philabc.ru/uplcv?utm_term=eclipse+app+emulator PDF link annotation
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/16692310678.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/10154991742.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/fakabetonizawowetinalux.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/gegolokorowigosoxaxika.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/25116989287.pdfIn PDF document text
    • http://headrepublic.pl/images/files/vilamuwirikumemuraba.pdfIn PDF document text
    • https://campermagazine.tv/public/file/88405408602.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/kuwapabafeko.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/nitudetaworimogev.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/wofororarepumifobatewatup.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139cee1919eb---varufupiso.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/wagajusoxapojewibupur.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/11508469299.pdfIn PDF document text
    • http://lejonhund.com/upload/tetobejozonudewojutu.pdfIn PDF document text
    • http://meta-min.com/files/ziloxifafawologatasotesaj.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210902172608.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/19745371200.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/jiroz.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/60246383399.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/87577024153.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/kivigetakogivonizazorufa.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/veduwarog.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/tikerusapivomudobavenusit.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6ab33bab6dc3400f022391201f0d25d7/funuxirigiravenalakajuzow.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/75750768574.pdfIn PDF document text
    • http://jyczgj.com/UploadFiles/file///2021091020503546.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_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 20668 bytes
SHA-256: 8dd03cc9940e97feff780c9e6992b4ce3fafb20afa8c4284df604d85b8499e74
font_01_sfnt_off00014db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB0 10512 bytes
SHA-256: ef3b1c3d0569699840a6c765413c9727c5be43469e67dff72c065aac71f968ff
font_02_sfnt_off000165aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1