Malicious PDF — malware analysis report

Static analysis result for SHA-256 0834ffe2aca0e0b9…

MALICIOUS

PDF

76.1 KB Created: 2021-09-11 03:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd5d7a85246dee6e631f1d474ec319e9 SHA-1: 12803e3d67aac9559241dd944ea1bbe6eb12f6ef SHA-256: 0834ffe2aca0e0b9d74513c6f1ed08b8f3a77ba576775c949b59c689a85a9cf3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://kmbb.at/userfiles/file/21241299315.pdf In PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/nijajasijodug.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/72105913870.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/15115690389.pdfIn PDF document text
    • http://pharma-tools.pl/galeria/file/74970501690.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/julidagologi.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/41240225832.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/5542601889.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/85587330213.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/22894258995.pdfIn PDF document text
    • https://visualarchive.bg/files/50525580358.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/dolof.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/50749721928.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/damila.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/nemajiwirewepikafuvo.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/84676264499.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/tegizufirubemixelebibav.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/69813907963.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613991308bb4f---medadavivew.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/rewor.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/8ce10np40cptrmf0eek3ul3ja5/wakaxaferuteligogeto.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/24347874612.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81347436741.pdfIn PDF document text
    • https://capecoralliving.com/media/file/sowidofuxuzabetelajebise.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/kerenoxipagojopakejulelir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=assassin%27s+creed+syndicate+free+download+for+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_off0000c595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 16848 bytes
SHA-256: b4a6151883d610aca2d51796ac94365fd5e4ba6578690a548caaa267e90e4e75
font_02_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 10684 bytes
SHA-256: 870ec3d7f72865600dc1768768878392283e7d5eeaa90ca35a96ddb82a22cfd6