Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc798764c4654c8a…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 13:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c68a10e696dd45051b0b589798ef5ddc SHA-1: 5dd22d2b0b2c5b35cb9bb58207fbc16b28dc182e SHA-256: fc798764c4654c8ac1a6eff97091a86f8bc6500dc30f03ff9d502a764050ba36
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with one specifically linking to a "nordvpn mod apk free" download. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing unwanted software or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=nordvpn+mod+apk+free PDF link annotation
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4468q6b5k1qbbj6gsegg23igtf/mugokurimunelulatusu.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/50698254297.pdfIn PDF document text
    • http://esipro.be/userfiles/file/63364227166.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/60736677575.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/81270299076.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/61776402698.pdfIn PDF document text
    • http://huefpdf.org/upload/file/54447309553.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210918_7BEB10FE33BE3B1A.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/91183472588.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/51685269103.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/14354711647.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/92517426569.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/tevavuxokupel.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/lamegozisa.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/14ff7e34f1ceeed2f201d8952e23095f/21893903912.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/66885796093.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/peleguvij.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/27318652370.pdfIn PDF document text
    • https://mkontroll.hu/File/zetipibugu.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/libinufekoxizijax.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/83217202502.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/kupupewebilibu.pdfIn PDF document text
    • http://hzqzg.com/d/files/48626597320.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_off0000c424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC424 10392 bytes
SHA-256: ed2abc313d34b03f79a781e0b1f8ef46f3dd2531d3f35713d53375f7c31727b2
font_01_sfnt_off0000db9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9B 17436 bytes
SHA-256: b3538fc9a0cbe247b99042268d86107f5cd04033a51aaa3a618c52fe512c5646
font_02_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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