Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e43a4145b8327d1…

MALICIOUS

PDF

73.3 KB Created: 2021-09-08 19:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 04f5292e855f4657090ea1dd230a6f38 SHA-1: a245498278b433a23352fb24dc8182d99dc404ad SHA-256: 0e43a4145b8327d18b819e8939c0895cb2ad7d3a26bcb44374f380364f2ce2d9
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure itself does not contain readable content, but the presence of external links and the classification strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=anabolismo+celular+pdf PDF link annotation
    • http://contactfm.be/userfiles/files/85340428908.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/satajobababavore.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/wagivovatag.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bb573898924cdd203ed88facd690a9eb/dotamevesowejo.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/zewojatoke.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/neratapopaxizovowefamode.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/91724333692.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/roseviz.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/jufomo.pdfIn PDF document text
    • http://www.praasia.com/file/files/bapuvapebina.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/vofalinawabasutufuxinej.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/22621984782.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/22112369928.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/fepazakidowizeginibivuki.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161345b0388be0---ketagegod.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/xekazesedogojoruvikanoxo.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/63638147774.pdfIn PDF document text
    • http://www.bandungmesin.com/file/56362863575.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/34015928188.pdfIn PDF document text
    • https://kokomanis.com/contents/files/24649173109.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/26975311279.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/goputabibawowenexi.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/bijinulexulojumuresus.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/52931157977.pdfIn PDF document text
    • http://df-2.de/images/daten/file/10706417818.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_off0000bced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCED 10904 bytes
SHA-256: 5cadf6ab5878b33b21c6cfecf67f8283dec1082df06d70d5716b03ac64ec0bf3
font_01_sfnt_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 16488 bytes
SHA-256: 6e2295cdb55e42108ef9aff75c4840739fb3b23cfeae56248eb160a56d358c14
font_02_sfnt_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1