Malicious PDF — malware analysis report

Static analysis result for SHA-256 c583cde7416c6223…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 18:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8756af286852cf38dbb618522c715ced SHA-1: 581c9e94803aa7871bf2a2382d23bab73f0671cd SHA-256: c583cde7416c62233530dd4c950d9528e49feab2536504c07aa5f30e513c0e60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this intent.

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://rspon.pl/images/wyswig_images/file/68660158928.pdf In PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/67790796108.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/97932561788.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210908092538.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/kuloled.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/59962029117.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/94886917856.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/womajoboxelukovejam.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/46023233745.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/xikixowugugazexogokefew.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/33811312958.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/taboxuxufuzuritire.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/46360056737.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/zuxoxugodepofuka.pdfIn PDF document text
    • https://ms1oke.com/contents/files/83081046283.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/9b130073cdc25f13dffbebed72efd22a/xazixeveti.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/xelobuxusapewoxanupiremo.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/56962836176.pdfIn PDF document text
    • http://vpsystem.com/files/fck/nurukipudap.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/6047241244.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1e78b8095---83469959171.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/maromil.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/morilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=online+comic+makerPDF 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_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 10240 bytes
SHA-256: e0d58c7f38b680c399e2b993652e87e1a7907451546bff03abbc67adbc7472fb
font_01_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 17988 bytes
SHA-256: d80c67b678806f4cfb854dbb7c57f6e4b84a59bb1decf87a4d321017056e7d94