Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d1fb5006c8fdc3…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 12:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 511df4d940046e18f948effb53c247cf SHA-1: 19a086b617d8b205898618fd7d0d508f26a3d17a SHA-256: c3d1fb5006c8fdc3fb0887ac068f18ccc3a390eeb380c221fa2645cb5ac3e343
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of JavaScript suggests it is used to redirect users to malicious sites or potentially download further payloads. The document body is heavily obfuscated and appears to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://badaranquehablar.com/userfiles/files/buxumuvagomapejemuvugato.pdf In PDF document text
    • http://abw10thstreetne.com/uploads/files/7056324247.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/7582188984.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/2048431622.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/38765351285.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/88546669269.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/84030736840.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/86ce0f3c4f84566e7dc7692f51fbed59/90255114121.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/bazuwewolanez.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/tasad.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/35674435576.pdfIn PDF document text
    • http://it-hair.com/userfiles/80999323783.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f8745957e---pigijotuwizikebixifuzije.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/63035566730.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/60869329242.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/87555864106.pdfIn PDF document text
    • http://ausafe.net/images/art/files/goxakenerovifem.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/52409706546.pdfIn PDF document text
    • https://arendic.cl/files/datulonunadazibov.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/lexipekawuronu.pdfIn PDF document text
    • http://climtech.com/files/files/jenebujokefulozi.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/62650103178.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/mozotajupejez.pdfIn PDF document text
    • http://infosierra.es/images/editor/tabapuwulefetu.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/juwej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=refresh+all+tabs+chrome+macPDF 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_off0000bc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC92 16576 bytes
SHA-256: 8d1b7111c7bad58bd95357fdf4c3f12314c9a6fa87fdb75c190874096708e915
font_01_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 10588 bytes
SHA-256: ee38e4e8168dac2a81e51c1df958a0637c31a0a22a14a954e7eac76f0fc846c8