Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d0bdfebcdaa61b…

MALICIOUS

PDF

90.9 KB Created: 2021-09-13 12:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 295d40985e07d0148e6c41601b3563fd SHA-1: 5043a1974cb4d21345d33c88ac52ee4c69a2a1f2 SHA-256: 84d0bdfebcdaa61b9bfb14ce76a57fe786dd4bc5bd47263bb40cdd5bd034845c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://catamma.ru/uplcv?utm_term=satyavati+2016+online PDF link annotation
    • http://schokoladenbrunnen.de/idata/89406257833.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/67829170743.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/59276675298.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/xanidelizuzikuwoputadupi.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/68777463562.pdfIn PDF document text
    • http://melvin.cz/data/zapofit.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/56397554990.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/tixurijadofuj.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/gexibofibemekelex.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/87708338826.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630764047.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/74888650760.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/5778369033.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/37343936202.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/43836567668.pdfIn PDF document text
    • http://yoron.net/up/files/surorujafanewuxugafegex.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/widapupomizaxiw.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/pasinunodedisurugumalila.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/7093570718.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/15034672422.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/62364907384.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/fomuduw.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/wuvovaxadejagovamilenotem.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/98360210250.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b559c1b251---lokuzivisufeluredovuwi.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/bomepofoxapofivikitafon.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_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 20912 bytes
SHA-256: 4a1de6f36def7cef618a0d5f440967fd0e86ba57c99079776f47c861fcc3b4ba
font_01_sfnt_off00012d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D10 10552 bytes
SHA-256: ed9ec071bd47d7f1f5174f3c49b2197bb50cb581c41b59e913a27e7cfc51ad81
font_02_sfnt_off00014568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1