Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a71ee31169fa47…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 12:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31721e49b55d82137f5d73929af0c491 SHA-1: 129b10294c44241b86d23fb431745424cd9c2dd9 SHA-256: b6a71ee31169fa47bc5ee002c9b4450eb0cf97fb962651d0e27d1c3c174bad66
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 ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=android+repair+software+free+download+pc PDF link annotation
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/25950547137.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd1e1d2c8f---73556588182.pdfIn PDF document text
    • http://oxi-dental.ro/imagini_ws/vazuzofonud.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/dalikaxumuledibovog.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kimujes.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/luxepe.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/45256177341.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/pepazafebewe.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161407cf336491---18472089263.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/witejetekapupab.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/fomagopexajelolodura.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/wabosipaxagiloderoboje.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/bodis.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/13386567769.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/25396858106.pdfIn PDF document text
    • https://wiltech-hk.com/editor_upload/file/61516282074.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/54338120954.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/nizurivunuf.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/walor.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/jenukodebafum.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/patuzuki.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/rabutoponutugelus.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/88650194312.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/27460725296.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_off0000b4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A9 17236 bytes
SHA-256: 7c184b297e781af42f06963d41599a287eaf2ea6d799ef8b73b4e036064558c9
font_01_sfnt_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 10680 bytes
SHA-256: 77ef5ff1a4750980d7d3f520980f2151744f52535e7ed6af57f02a8d8b3266bc

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