Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda6c264aebfc744…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 03:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e30a958be2b797dc7913789e5613960e SHA-1: 9fe8ffb6624d9b5da5678a21a4f044654c61f316 SHA-256: dda6c264aebfc74475607681404a81e3cefa2f516375810a2acb43bc17c9c705
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains an exploit. The presence of numerous external URIs and a PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document's primary purpose is to redirect users to a network of sites, potentially for SEO manipulation or to serve further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://mtydizayn.com/userfiles/file/xazawikoguper.pdf In PDF document text
    • http://massintech.ru/img/outer/files/88983998127.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/25757899692.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/78072211275.pdfIn PDF document text
    • http://lejuriste.ru/files/file/49228135855.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109201423031306.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/ridibitogevatav.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/11158379685.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613546ba2034d---2476501327.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/vawomidumitavapaxel.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/10975806117.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161404d7f8ac4f---pupamunewojepogi.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/gazesipu.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/37078105250.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/pokobesifuwalekugixetok.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/18620516544.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/46068896401.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f898bfaff---zunevifi.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/37820602754.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/46493730801.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/58257421721.pdfIn PDF document text
    • http://grupophi.es/uploads/files/29315292788.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/88749677220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=incomplete+combustion+of+hydrocarbons+equationPDF 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_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 18064 bytes
SHA-256: fa1959fbd03f892a257309b62c45d406701b9e6841de0e03ba1b8fbed8ee2ad9
font_01_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 11336 bytes
SHA-256: a7c6f25012af262b5e19559e78525853e16cc44c4ad45a6bdded2a50fbadc834
font_02_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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