Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52c282b35642d88…

MALICIOUS

PDF

71.3 KB Created: 2021-10-10 06:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5154f6ef863ab8dfda735c14384f8508 SHA-1: 52674551c58fa207bdcb990fba8aa09f32412aac SHA-256: c52c282b35642d8838c67b78d110ab69751aa1e38ff7095db9a5d88e859a97e0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ketchas.ru/uplcv?utm_term=indiana+wants+me+by+r+dean+taylor PDF link annotation
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/felizu.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/zavixumevarunopafukabup.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/wolebigaragonizoxerojupov.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/78206560495.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d762b9aeaa00ad6a55054600061ac25f/jukoduliniz.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/45231136966.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/89089798689.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/18514594177.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/77628159935.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210924_122350.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/tatikiwoperobajolafe.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/vepewetexifobo.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/48539919878.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/2902789547.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/fasisurikiriro.pdfIn PDF document text
    • https://finliz.lt/i/File/dukukatogo.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/basekamatoxejuwamixoneb.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/13996196491.pdfIn PDF document text
    • http://helices-evra.com/userfiles/file/zonatevelowetiba.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/17958345025.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/bonokuluwagalomevuruf.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/upojunibuletaf.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/xuzaletekema.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/belax.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/26065270685.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://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_off0000b949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB949 15944 bytes
SHA-256: 6a071e045edb6b2e1dfbf1f4fe4c8f095aaf22636cd203a464a3f779aea0c3fe
font_01_sfnt_off0000e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 10700 bytes
SHA-256: 74fe9667ed29cef355b342c5bfd9257928bee0198c86cddf7d70e60bfb61ee81
font_02_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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