Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93314d4c64902d8…

MALICIOUS

PDF

72.2 KB Created: 2021-09-21 02:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26e538807a83483e0156246b89a322e3 SHA-1: c8d5d5210362464722d9216392618b5c6a735b23 SHA-256: c93314d4c64902d8b7eef69aef3bb4e373e8bcb93fa17c4f42667229a1a6a4a9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users to a large number of potentially malicious or low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=call+of+duty+strike+team+apk+obb+mod PDF link annotation
    • https://dgssu.com/upfolder/e/files/20210912080746.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/kugifenosubudusipe.pdfIn PDF document text
    • http://tradotel-riviera.com/file/duxapefadevaw.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/4142064713.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/wixapojomoviwu.pdfIn PDF document text
    • http://aminotp.com/upload/files/88329908384.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/vuzupilofumilebirunewefa.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/39983451917.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/22800063435.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/xogigikoga.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/dejetezuferup.pdfIn PDF document text
    • https://stvorki.ru/files/file/rodonuzogogofimefotone.pdfIn PDF document text
    • http://tzsunup.com/upload/gubokisanorimis.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fe3e99d33---kunutafabanalugurosokagip.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210902011330.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/87067125166.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/mufuwosir.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/19954373874.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/080219333303.pdfIn PDF document text
    • http://zzquansu.cn/d/files/zekekolap.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/55005572004.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd689f92c---xururizoresivebifexobuzok.pdfIn PDF document text
    • http://grupophi.es/uploads/files/rapasiguxulidabobeg.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/tixijunufupobobebumozusoz.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_off0000b5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B5 11032 bytes
SHA-256: 8d9069b05c2ef964de1159d827b415a279584460c42c9b17d284c1e509f74420
font_01_sfnt_off0000cf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 17020 bytes
SHA-256: cce87c56c077c00414cf5a64dde3cde2375efef81f4dfb932dbbc971896d6ddf
font_02_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1