Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a3165fad6ba34b…

MALICIOUS

PDF

74.5 KB Created: 2021-09-20 10:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 845de90d7e7e7a03311e23c997877337 SHA-1: 8978af8cc6b7387cba12ab56f38108a994afd816 SHA-256: a7a3165fad6ba34b914c2d996ed21ee97e763b8574d83c84ff416872aa514a82
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and the high number of external links suggest it is designed to redirect users to potentially malicious content or facilitate SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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://kamerton.nl/clientfiles/6279080801.pdf In PDF document text
    • http://www.radio-kum.si/data/files/17585795408.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210913111059148.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/96336583657.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/61030003910.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/73mbbi1g466k6q4fgickt3s9p8/75991365458.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ca05453b1bb544a29a131e5b6a552845/wumusawizigomixedefan.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/74262350695.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/regewamudufubefi.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/10531108864.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/wolibemug.pdfIn PDF document text
    • http://recrute.fr/files/files/nopodomakinorewumadetit.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/1172290508.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/31998338240.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/noborojomajovijixugi.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/91480122026.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109082352209391.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/sakavuri.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/78599918185.pdfIn PDF document text
    • http://net-marketing.hu/images/files/87257959488.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/ponopetifafosijowefuroj.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/vimozovisewijujuk.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/49713492668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=isaimini+tamil+mobile+moviesPDF 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_off0000c181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC181 16968 bytes
SHA-256: 84303080e1acc21a788614e7a787faafbf291a602f4f73f879c1c9afb5ee2e8d
font_01_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 10328 bytes
SHA-256: 6aac9459935b5aea1930986b96e5db19f8dd8ab8f27ae9d43cb41de161389115

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