Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58ae0cb3e6c6ee6…

MALICIOUS

PDF

70.9 KB Created: 2021-09-24 13:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eeb15f3ad61831af1266322f5f767b03 SHA-1: d55c1f5a84ebf5ea2a4ebd7bde22c707a756cad6 SHA-256: c58ae0cb3e6c6ee626e4d4ffef6e4ab8c78d3f040899226654550afe8b188eaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=how+do+you+video+chat+on+an+android+phone PDF link annotation
    • https://pratham.one/file/bopajizon.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/kulijinulaxefaruper.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/vuxefulasasojudugu.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/musaronixoj.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/95452755234.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/malakafisunugitu.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/vuxurojaniba.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/97460278590.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/14802267385.pdfIn PDF document text
    • https://pecintajp.com/contents/files/21552796964.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/vazixumig.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/jaxukatefod.pdfIn PDF document text
    • http://apex-architect.ru/images/file/mupuzeroxogaluwopumewutil.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/diwodasuxesujana.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/punir.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/pafowatet.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/fovixajemib.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/blcq95sc7p2p405qb4a2c0ed17/zilixutokijozodulovilure.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/82385082753.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c8a32330a---gidil.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/88787451575.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/bofixuz.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/6171928909.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_off0000b07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 10756 bytes
SHA-256: f5a29166a03d6ca3b30bccbbca8f824ec6b6171d4c6b355849df4ab1f1567ed8
font_02_sfnt_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 17304 bytes
SHA-256: 30ede851e43c6c8a9f5abc95fed4e8efbc6b411ccd16df3200c2747e4582be38

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