Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75fc49265625143…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 14:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a8c3635c03dd8fd923d0d7ce175fe838 SHA-1: 9b431ac6f47b60eeec9675c43328b8e7ad85751d SHA-256: b75fc49265625143a001d7af901fa693188a7349f5b7c650a083b409a2b59bba
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kbchina.de/upload/78068472337.pdf In PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614b021d4efcc---29897709622.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/pomurakoneluvas.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/13597136116.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/zodebidunogobibupu.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/dupopawewuzotelobiwukejo.pdfIn PDF document text
    • http://belloverde.net/emailer/file/26967672074.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/58501604867.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/jexefurit.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/goniwag.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/70342262354.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/kemagugakiguginasuzoj.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109040630292292.pdfIn PDF document text
    • http://getem.eu/files/file/kipurimu.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/wojexonawodamix.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/murifegedofukode.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/9249546793.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/49755417212.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/21954416229.pdfIn PDF document text
    • http://standardamulet.com/files/files/zowozajidevetupare.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/59970691950.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1e435d256---nijugakifisigotosudenat.pdfIn PDF document text
    • http://anninh247.info/upload/files/koxonisumawimek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gta+sa+1.08PDF 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_off0000b197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A9 14880 bytes
SHA-256: 64b8cd528f0cba9d098df5b8349e779addd21affac8ef9c29c7ef21d9d0715b0
font_02_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 9996 bytes
SHA-256: 45d74bfce3d85c8e3e36dea5ff4c9e462ebd4afb1029ce43930633b0da5cacde

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