Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4f6a32a4c59dcc…

MALICIOUS

PDF

71.7 KB Created: 2021-09-11 23:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b0b96506119d9ddaea6a22e90673481 SHA-1: 857528d1d0f856d3c0317fb4f46e0d0be2aa79d1 SHA-256: 0b4f6a32a4c59dcc1f82cbd92b77b4b1ae0b2b41257394e1c33ae62c8dd3bd19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs indicate an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=fast+and+furious+5+full+movies PDF link annotation
    • http://baharev76.ru/userfiles/file/1181440147.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/45998762843.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/35003219554.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/70711344138.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/xuvufigipunedes.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/zotelimufilevazisavemo.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/5812640450.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/50408035719.pdfIn PDF document text
    • http://adice-area.com/pictures/files/19718696703.pdfIn PDF document text
    • http://talesma.com/E/file/83595211849.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/nexejeruwexovazabejit.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/motasesufigol.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/legad.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tibafis.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136896c22cac---gujamikilisumugajetivodeb.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210907_095717.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_off0000b473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 17224 bytes
SHA-256: d697d5ca9820eb4f72027ff4774a41bfa526705b43db5a58d173f8a8cb4487c7
font_02_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 10792 bytes
SHA-256: f5b3c297b6c767c474411cd8211b49a3df6392ba2d8f46b99837b5f12a8f92f1

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