Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bf93218f73e652…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 17:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1fc2e1ab16c6c365001c34b733d8c85 SHA-1: 42e42ccabd67747bf1a0bc7911aab59c57642542 SHA-256: b8bf93218f73e6526c22169ce7408800a824c278ad715c039dd2725eb3508cbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://garglob.ru/uplcv?utm_term=fractal+space+hd+apk PDF link annotation
    • http://sangiorgioautoservizi.com/userfiles/files/37900114314.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/64159850510.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/menuwemumifamusatovetev.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/84436084812.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/36921049640.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/bifaluli.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/bagafete.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/69912273891.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/tenivokakiruvaxuweralu.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/46744543606.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613032983f5b6---20518038702.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/madivorukibisu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cl7kavj2bhahuot8lll0ca0pr1/88298349198.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/migitabuligovemeruvokixi.pdfIn PDF document text
    • http://atya.eu/files/file/14015914093.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/domukorekodevexilubukosu.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/1022295651.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/53318931522.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/nanaxoj.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/18030209396.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/28735491825.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/96785201444.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_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 10364 bytes
SHA-256: eb0feaec97f7de9c46be6fba0b100e88038f6246861ec01a65b0cc598630e8cd
font_02_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 22700 bytes
SHA-256: 3c39089778ac7e068b47104b072a54bcfd9d75e20114c9b9981ba729aa3f8f47

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