Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d264ceb77814a81…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 10:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fb6af573d1394038530522dcb355c597 SHA-1: 3fa28d8d839debd5cd28116726a2ef9d68eb8cb1 SHA-256: 4d264ceb77814a81a91cf32136b93c18670c8644d95619c6058f5a86650121ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, indicating a phishing or scam attempt. The PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=watch+naruto+online PDF link annotation
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/bezoxedaraxujipupoja.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/kekawiluk.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/65572926393.pdfIn PDF document text
    • http://darstin.com/userfiles/files/21836773898.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/garus.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/getasa.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/zidigofikaxinadov.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/9892981598.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/68874214570.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/27994213101.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/24143170965.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/16507845432.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/tunoremivagedapit.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/riferuxavawajux.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/60841992840.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/25282965807.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478293b6fa8---59914661284.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/devakagot.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/99417860593.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/11847376525.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///sesekoramebiwazumapefozox.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/c2jac6eitsae6dn03rdpicbmo6/javinirid.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/nefulij.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/55997214392.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_off0000b293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA5 16076 bytes
SHA-256: 3b84b92c862c8c6bf43767c19ac8bb1cfbeef6af7283bd080e9e9af646daffaf
font_02_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 10252 bytes
SHA-256: effd225093b63d9cc8225ad0aaee4b9ceb59f8d8cc4ea59214cebc76c2be4b80