Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8faa886e6af55d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-22 19:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c65b3d40cb54c8c5cd8ccf44b4335af SHA-1: f1c3ec79b6fe894f412cca41dce3ebc04c630d99 SHA-256: cf8faa886e6af55dd4537776dd44faaf9c88e4108b5c4a1b3a5ea418858ffbf8
126 Risk Score

Malware Insights

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

The file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious PDF files on disposable hosting, indicating a likely phishing or malware distribution attempt. The PDF structure and embedded content suggest it is designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://artvideo74.ru/upfiles/files/mipudefox.pdf In PDF document text
    • http://96rangjai.com/userfiles/file/9937717882.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/zaluripasebewukil.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/28410687652.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/feliximovomebonikevil.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/48408529649.pdfIn PDF document text
    • https://mkontroll.hu/File/36892453197.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/130015256026.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/tewajavitaxelituleduxajam.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/49194351901.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/rubufi.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/42375003017.pdfIn PDF document text
    • http://hydrem.ru/images/file/nolatuwolijewanisolu.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/74235479007.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/tumavewomis.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/digexunajubusisig.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109160552021822.pdfIn PDF document text
    • http://nensi.si/upload/file/88871849740.pdfIn PDF document text
    • http://labradory.pl/file/26882540619.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131d47dea8a7---kimitor.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/barotolenovivomeperaxe.pdfIn PDF document text
    • http://yuli-china.ru/d/files/36688546563.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16133e38e82ba2---86251201363.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/79102811809.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/45400121756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=charitropakhyan+in+punjabi+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 10856 bytes
SHA-256: a6b52866d06929cf41973a2673968f3887b75b3d0564e910e63b701f42297f85
font_01_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 18544 bytes
SHA-256: 57421e2f3141f2c71f88ed62595d3ced8349f36321f01a3af2f11aa820a50e4c
font_02_sfnt_off00012a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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