Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b5586bcf27f32a…

MALICIOUS

PDF

68.8 KB Created: 2021-09-21 18:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 659bc70aa558fe56c310e8135376786c SHA-1: 950d5627f3e42d8dcfbb8c672a7c26eae5622e60 SHA-256: d7b5586bcf27f32a927bb446f6e69a9dae9d8f61cbff9323a8228c59036ab72c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/uplcv?utm_term=farming+simulator+game+download+for+android PDF link annotation
    • http://haai.org/upload/file/dedepo.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/botavebemuzapaf.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/juzafopowufi.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/jixopojeporegiperiwude.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/382715257.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/kimofew.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/mijiwavajasesutolom.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/88504932558.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • https://interativacorretora.com/fotosempresa/files/14220360543.pdfIn PDF document text
    • http://rideco.hu/upload/file/23186844011.pdfIn PDF document text
    • https://ubranni.com/uploader/files/89959415538.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161422278d6620---10291836770.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210910170629126.pdfIn PDF document text
    • http://normel.org/files/upload/file/15765687851.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd9a10746---lamidategikesusamutux.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/9241457026.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/finavo.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/kijuvojoxageke.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/32254655259.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_off0000af45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 10860 bytes
SHA-256: 022223436bc63c3e6574027fb4ad0228bfbb41ea83e87bdbed19c397d0ed5163
font_01_sfnt_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE045 14976 bytes
SHA-256: 9515cf7525a62c18e72c0d11114d84144a3e95cde81bf3e9144e4f37340ab86c

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