Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fe2b6a74cc16c6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 03:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73cd28b5340941ef8edf09599aae39ca SHA-1: ae064b2dde0883603fba43ea1825f779fd3dbedd SHA-256: 55fe2b6a74cc16c6010409fe1711f9c36a802c442995678e78ec1d92334e1a43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=android+disable+screen+capture PDF link annotation
    • http://sangjeom.com/userfiles/file///surakaxabudufonuja.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/29242244316.pdfIn PDF document text
    • https://redac.ch/upload/26389170161.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/jatodu.pdfIn PDF document text
    • https://ratoempat.com/contents/files/42115913520.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210909060052_yzwtz1.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/jikesobiwapog.pdfIn PDF document text
    • http://szwygs.com/upload/90416584012.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/wufufakunofin.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/piwupaw.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/linidepimukijuvarawam.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/69115097262.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/naxed.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/pajosexiwubiwelutanakes.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5ecbbba91e3ee145732bb46f8131311b/nezutiba.pdfIn PDF document text
    • https://777mto.com/contents/files/piroluxividotiloririniv.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/32279329020.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6391ca68---64087418234.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/doxazoxubet.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tobesukawugemagatulalavi.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/noxideterogadusevuse.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/wuxinis.pdfIn PDF document text
    • https://znalac.com/userfiles/file/biwepegirej.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_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 18020 bytes
SHA-256: ada68122e7612017bd8b0594c4b774f4ebbc80481563a5e97e6aa6d4eb2147dd
font_02_sfnt_off00011841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11841 10728 bytes
SHA-256: 9af33d6c0a634729ffd9e8d9e30856dff4f193ee2bd59db00b663e6536e848f6

Open this report in the interactive analyzer, or submit your own file for analysis.