Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da80bc3f90efa37…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 21:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bc92a4c4a5263a6a6cc1f2f6a43d15c SHA-1: 61340f9eebfa08d453f573f42b6e62a0a920e506 SHA-256: 9da80bc3f90efa37b19eb3a4417cff9902731c23a81e9c235bd58e1a52c03e25
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to suspicious domains and are likely used for phishing or to host further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://projecthouse.bg/uploads/CKfinder/files/dixolafubixixikuxe.pdf In PDF document text
    • http://hoachathoanggia.com/userfiles/file/xoluxiroga.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/81628673819.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/rekawuxevegur.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/mapasabogoj.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/dubokilureguzidoko.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135954238370---xunepujijarodujisob.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/defipopatolexazutuwutefo.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/jaxokosefopekudikapu.pdfIn PDF document text
    • http://steinemann-ag.ru/viwawarozubokex.pdfIn PDF document text
    • http://bdnchem.com/upload/files/gibejefekoxelefunor.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/49991304837.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/laxomowiruf.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/5469620207.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109120416458763.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/40122260542.pdfIn PDF document text
    • http://badgerhillfarm.uk/28755271530.pdfIn PDF document text
    • http://esangsok.com/upfile/files/21734993302.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/4435645840.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/dulibikite.pdfIn PDF document text
    • https://linker.tw/files/zofuvikegulevoruzubalemov.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/fosaxolekuwemigepebixeno.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161303ea5cc38f---77338910333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hack+dragon+cityPDF link annotation
    • 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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 10396 bytes
SHA-256: fc24b21f7439d84655e5d76f6a1c184864d4675edf187ad3445a7609d7a993e0
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 18272 bytes
SHA-256: b3ba16e050162ed2291510879f364a58a24e71d15f1f8e33f9466fca47f255d5
font_02_sfnt_off00012663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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