Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c5c7b2a8acb162…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 08:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 990ef8921a8a6bc599157dc876d92945 SHA-1: 1e2595b4f0925406960c18bc94e717fc4f7e73c2 SHA-256: f4c5c7b2a8acb162ba4a68ee84891a4f105a36cafb7119e9b17a15e2520508a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The file contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://laborke.ru/uplcv?utm_term=driving+license+sindh+fees PDF link annotation
    • https://padservhosting.com/userfiles/file/52286596771.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bilaz.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/rivesaxomasasit.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/tipelar.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/37329174680.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/94817230374.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/kadeborido.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/30909956988.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/67525721760.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/nuzenado.pdfIn PDF document text
    • https://tekmaker.com/upload/files/jidogavaku.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/39541178516.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/wapoli.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210914091518.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f18b109733---8080451807.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/lexebobifazejojodazelut.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/32444234571.pdfIn PDF document text
    • http://wsm.hk/images/files/tepudugojevigolebe.pdfIn PDF document text
    • http://rongqichem.com/upload/files/15678785643.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/7g3pdnj4mht4v7ake49t8oumn2/63923529321.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/32272129922.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/93024043466.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/vivipa.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/68365531689.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/76308720356.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/28687028613.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_off0000be1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 16404 bytes
SHA-256: f5a311ae5f6d8fdc95676a842653b9b68c2ca25597b857541afe9c77331cfdfe
font_02_sfnt_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 10440 bytes
SHA-256: 354ec3b3cf87380d6469948989f0bb311b31cf577bcb3b2d346035e22facb2a9