Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d451022ac7d05e…

MALICIOUS

PDF

70.5 KB Created: 2021-09-14 23:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e50e178181c817d07c8c64e9bd8f9643 SHA-1: 6a6f7ba31ce782c4663970bc29b106b312ca9a22 SHA-256: 35d451022ac7d05e22166c33477d0cfbe96a5c238ff111fc1e0d29bbc8b8cc20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=bollywood+movie+2019+full+hd PDF link annotation
    • http://cmsrecuperocrediti.it/images/file/90370401813.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/27096010439.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/bokaresig.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/wadikif.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/gabuvuzimugomuzafuke.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210901_18298F0F97C8BFF0.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8387a73eddbca0362b516087e27ccb5d/kumaz.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136299523b6e---24734885768.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/55316612683.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/42247376933.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/fubajeba.pdfIn PDF document text
    • http://kahasat.cz/data/file/gojolavafiwezazilotadako.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/warurixipaled.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/43807635370.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/buluzaraxabinikifisezizex.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/zexagozokob.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/xaxidesobosi.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/34194246732.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/jebowasugevuvositox.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/matesolitefasibetadu.pdfIn PDF document text
    • https://mashura.co/userfiles/files/xilowofifasagafomukopop.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/bagotufipenigu.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/lojokip.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/30104429130.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/56011151249.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_off0000b2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BC 15948 bytes
SHA-256: 8bfd5fb4a3c92520244bfb0139cda73d0c706af16e5e0e7c0887ac2151c48b74
font_01_sfnt_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 10868 bytes
SHA-256: 0106abf9f0ffa53448f6152599e7c259ec145582988c80618d8592f20f08cd4d

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