Malicious PDF — malware analysis report

Static analysis result for SHA-256 9837c24a61f55c3a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 10:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: faa6f5b3afa9be73f14c4644684df52b SHA-1: 78250f6ba8e193870e48ec6134fcddfc87cb4085 SHA-256: 9837c24a61f55c3a15fc70cd94cb62ebcbd1cd6001f5cb7382762dbe24dc10ab
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, suggesting its purpose is to redirect users to potentially malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery. The file's structure and numerous distinct hosts point towards a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=how+to+turn+off+android+accessibility+suite PDF link annotation
    • http://eviljoy.com/UserFiles/File/jixupolipufolijozomegokax.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/vosewi.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/fujajumelenenotuwez.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/38379778092.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/97760155298.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210907000700.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/pekexu.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/giredirinipamuwufud.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8e142959---29661446522.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/98706630823.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/73991197667.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/katusemalafa.pdfIn PDF document text
    • https://chptravel.ir/data/file/sesijalefufezinugukov.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/72657062619.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/13/file/20210913_151628_179.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/zifirijibugitawub.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/rijazazoxivi.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tixubebuno.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/69914676440.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/kutox.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915686ab59---56369480512.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/kapulu.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/mizomef.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49445639366.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_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 10900 bytes
SHA-256: 02b00e06df43187d83355d71cf3638a7d7b8894a33dc17aad7e176be95be4f93
font_01_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 17152 bytes
SHA-256: 6bb8f57a9865817216dea0a7f7d7fbb4e74fec9c64c3a9643a744f2661d8861c
font_02_sfnt_off00012cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1