Malicious PDF — malware analysis report

Static analysis result for SHA-256 1502dceae241f359…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 07:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 350e675153ab67d595c2d945c99c3795 SHA-1: 7c3135ce60442a5a0d0e7357df5ed4047051c1be SHA-256: 1502dceae241f35904aba931ff247f899c3ce8d237fd3d675567b2da070fdd23
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a significant heuristic indicating it functions as a link farm on disposable hosting. The primary attack pattern observed is the embedding of many links, likely to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://catamma.ru/uplcv?utm_term=gacha+animator+beta PDF link annotation
    • http://ozanatalan.com/iboard/includes/userfiles/files/tewuta.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/18501427662.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/dagaz.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/lefadanowideka.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/likere.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210913170456.pdfIn PDF document text
    • http://sns.hu/_user/file/ledudisimo.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/20595764637.pdfIn PDF document text
    • http://datcat.vn/2018/file/41315423486.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/gamibopabakogewom.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/kejevipizolage.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/82472041677.pdfIn PDF document text
    • https://onecre.com/images/content/files/vedibatadidebit.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/23083916060.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210903012551.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/o7oadkfc4h9nq9oqi1447a34dm/janaxexixadepijeve.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/13907162022.pdfIn PDF document text
    • https://magerp.org/upload/files/14986024533.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142268151db7---41024026803.pdfIn PDF document text
    • http://techbis.pl/files/file/65543975735.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/vusidovojapexigu.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/gazidopigopa.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210912224623920.pdfIn PDF document text
    • 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_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 18480 bytes
SHA-256: c8738aa9dc29425ced34e52a61675ee40f73c366bd075bfb97cd142c7469985d
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12196 10460 bytes
SHA-256: 5f4dc72b8e07f58872f81c461e419ccde86881b2fb02abd6bc94140fbce49a57

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