Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b9db6681695fb7…

MALICIOUS

PDF

71.3 KB Created: 2021-09-21 20:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44672c7c7e90ec7e91176d9d094ec998 SHA-1: 4d5064d718e5cf5eb878eac1dbf10fc14716ec0c SHA-256: c0b9db6681695fb7a324a0b6f1e8da97a89439b8fcb996d533dbe26394df8dbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, indicating an intent to redirect users to potentially malicious websites. Although no scripts were explicitly extracted, the PDF structure and external links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=ps+cc+latest+version+for+android PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161419d81bb826---kiralokezemazatojajonijis.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/15246284409.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/30484363531.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/2944414610.pdfIn PDF document text
    • http://rococosofa.com/files/files/wusidazosul.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/kipajoroloxakozovakomuf.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/lagaguradamufupisu.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210906_A65B9CD28CBB8944.pdfIn PDF document text
    • https://kawanmto.net/contents/files/pakedipizafugogu.pdfIn PDF document text
    • http://josquin-capella.de/download/remir.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///pitolaturujupetesipojolas.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/34d0920d2265106c40d71dd12cfdec58/74828793628.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/rarupusawumixaniwugu.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/bagikawikisoruwesivogori.pdfIn PDF document text
    • http://maulich.vn/attachment/files/zitilikilaminukinugu.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/xinomowotu.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/96747609434.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/20259331385.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/fakolabakegewugijemogo.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/juteliwogeniwedexepaw.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/lozif.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090210052073499.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_off0000b67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 16128 bytes
SHA-256: 89cc770db93ac22a2138aa43900aa49a758986ae307c5fda549d5e974cab3651
font_02_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 10536 bytes
SHA-256: 735a63859e47ab7e6efa168ecfc684be9e4c829bc31e940214c382ffa9705428

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