Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d0d07c7ace5633…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 18:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: fdc0fc2d4b0aecca06fcc64b1efb2919 SHA-1: 1bff6f80e950a675d3d5439f801312e050574bbe SHA-256: 24d0d07c7ace56334bc6cf408d1d3d80188173c41d3a6dfe8e4743d857167619
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to other PDF files. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the distribution of other malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://jadever.vn/Images_upload/files/dugoxidonojozeg.pdf In PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/puvure.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/gutor.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/geduzajaxewir.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/xowosumemif.pdfIn PDF document text
    • https://armenia4d.com/contents/files/87599863860.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/wiremikit.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/xitegolixem.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/tepajuvobilikovenof.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/tigisixavovoxusibozap.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/gufatev.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/takujakudi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/14721161640.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/putagiluvepuxamigo.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/gimako.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/42816391420.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/22549442236.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/21033477264.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/mozonukenowolokurilogojo.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/sesob.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/tabasenimufonekono.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/liburefotavisafi.pdfIn PDF document text
    • http://standardamulet.com/files/files/7454932663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=meilleur+jeux+avion+androidPDF link annotation
    • 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_off0000d877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD877 20036 bytes
SHA-256: bc7e4edebc8c162b179ec2af312080b5f592b26f8ef69458b194cb3e6caccd35
font_01_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A0 10364 bytes
SHA-256: 04595a17fdd958c2122111fa33e9e51c40bff12c4daa1e99f8d3a56ab695cdf6