Malicious PDF — malware analysis report

Static analysis result for SHA-256 52db5f61bafab524…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 15:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a3380b0754e4d5d40198afe53478196 SHA-1: f771c6d99fe712c9386973c2053713bd575a4540 SHA-256: 52db5f61bafab5240ca86bd7a626ff9fb501a6dd166676959fa4189a773a1c4d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=distance+traveled+definition+physics PDF link annotation
    • https://strings97.hu/userfiles/file/51087698501.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de0e9a9379---finulolafavu.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/nolagazowubunudaxukekem.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/mimit.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/85157449168.pdfIn PDF document text
    • https://777mto.com/contents/files/sopejotajal.pdfIn PDF document text
    • https://ptogel2.com/contents/files/xanuxali.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/gexosemajibiwufor.pdfIn PDF document text
    • http://halmar.info/userfiles/file/pogipososawad.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/54868333508.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/xuwezagakanafinopulu.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/2353069814.pdfIn PDF document text
    • http://bulmarconsult.com/files/42688519962.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/11187701022.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/75792296251.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/55760927926.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/pubow.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/jugomezivusoburuk.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/bovenabagutemaxen.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/39896873477.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/wigufopufu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f313f8b2da---77439345757.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/52086144707.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/limifos.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/jekutotonixutiwujid.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_off0000b4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C5 18196 bytes
SHA-256: a825e80fd3dd096427cfd4a5a6316c7cf684fa9fade047c48d06230ff22499ad
font_01_sfnt_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 10896 bytes
SHA-256: c46343d5ad330b0a33948534f140a6531af23bd05d6c2737b7fa206b0c5a3945
font_02_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1