Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8a7ffcfb803ac6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-10 21:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f374dd563dcdd1d155a3aa667f3702de SHA-1: 2723f1b9e2cec8ab3c0987fa733fefad888e3dc5 SHA-256: 3b8a7ffcfb803ac6ad9c1f53199306ed6ab4d696f82e2fd9bf934deb210875d5
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bibliotheque-des-arts.com/ckfinder/userfiles/files/56881757007.pdf In PDF document text
    • http://cargologicru.com/sadm_files/19315650322.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/78577568450.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/84938870467.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/zunuvexunijurabutobol.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/42458348156.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/92097508016.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jizisusosewuduleno.pdfIn PDF document text
    • http://lukinserv.hu/file/64126907341.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210904_F704098955DB50CD.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/mesosuj.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/sisedixi.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/vatirovusemusol.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/jikero.pdfIn PDF document text
    • http://canoeing.by/pics/files/xewupa.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8509a92361d3bda7f29e3670f8a1cc5a/28002630016.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/vukokafo.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/29151737983.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/nukagomegu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378091982ee---fipomugodifulad.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210905_C56D17F996C63C5C.pdfIn PDF document text
    • https://medtek.vn/storage/file/95768649330.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/sabezewimavesa.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/30351068362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=peliculas+en+espanol+2021PDF 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_off0000c245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 18960 bytes
SHA-256: 5b95d3b250b7abd219fc25c4a20a9810b134d30a46c86fadfcd8c5603962a068
font_02_sfnt_off000109e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 10564 bytes
SHA-256: 6cfe46bfed43e939c4e86cc6e633fec133e69b0fd2e4fe06dbbb0dad3c2b056f

Open this report in the interactive analyzer, or submit your own file for analysis.