Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9802b89d274cfb…

MALICIOUS

PDF

104.3 KB Created: 2021-09-11 15:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 246d07207deac120793c430ed93f8384 SHA-1: a307af41099338fdb924af2ecb3168d0cb81b41e SHA-256: 4c9802b89d274cfb6efc5a55cffb92cdd6d1bcb7e2f550757c85035e335b463e
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malicious redirection attempt. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/ginefexisobexowapuxuloma.pdf In PDF document text
    • http://teifsepahan.com/files/file/puvabadatiweletazew.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/nexebanegebelitilibased.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/rudiwetagegib.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/83905852646.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/60837374279.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/zodevanowi.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161354699cf0ea---92760891636.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/67017054317.pdfIn PDF document text
    • http://szcftz.com/upload/81469248820.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/26862241040.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/53711528894.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/zosojawurozeboma.pdfIn PDF document text
    • http://househouse.it/userfiles/files/sazepapu.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/62271295052.pdfIn PDF document text
    • http://irollee.com/userfiles/file/44366777938.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/vasuxeda.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/10016528951.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133a55c1b23e---ritar.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/70774396102.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/batev.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/goxapok.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/30687034641.pdfIn PDF document text
    • http://videlec.be/ressource/file/lunubinuxugorabanomagodo.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/fuxon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=head+first+servlets+and+jsp+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001782a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1782A 17560 bytes
SHA-256: 2c6a26f89c8dc64843b825446aeac1237c2c4613102b2c0a6a6fc7327502ec35
font_00_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 10560 bytes
SHA-256: 2a97ed4ad5c5a661b07b89641735a2809e83f5b6a552c3a40e13a2d8ef599eac
font_01_sfnt_off0001310a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310A 18040 bytes
SHA-256: 89c2035f1a87d8ad9c6f5c2fd69b93bffb80d750cc02e1791a5931777798f13c
font_02_sfnt_off00016019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1