Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef2492667787fc2…

MALICIOUS

PDF

74.1 KB Created: 2021-10-10 14:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 95e1cbef8822f275f6dd15d825167f6f SHA-1: 9e3179d72e93c2e3b3793bd51e7fec8ce12b0a22 SHA-256: fef2492667787fc2e53b99e513e16b716f105e9a7329bf2e63966260ae8ac05d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=science+fusion+motion+forces+and+energy PDF link annotation
    • http://architetturaurbanistica.it/userfiles/files/75161672736.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/wufufarulavofosovanu.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/49870929615.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/vavodajugojupidetigod.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/laduvupolanosifofakilelo.pdfIn PDF document text
    • http://jcsh.bluezp.com/ckfinder/userfiles/files/baxosegisosona.pdfIn PDF document text
    • http://hkacca.com/userfiles/14069337214.pdfIn PDF document text
    • http://npas.ru/pic/file/tegenodimivafenonavotilik.pdfIn PDF document text
    • https://hoavily.com/uploads/files/pogujuxowigagal.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/meforuxonubetojosoperi.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/waziforaveso.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/fadubovogibis.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/34582161681.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/jufabetudadibaga.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/vefusosu.pdfIn PDF document text
    • http://apothepharma.com/upload/files/gejogorazukatalunifuwi.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/serawotomivefuve.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/dazoripizikokizukimu.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/lewijifimojiv.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/3218915579.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ab160984b62f0bc1e3adea8e006ec0e8/62032236359.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-24/20210924083558555042.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/64460297324.pdfIn PDF document text
    • https://camphacement.vn/upload/files/fazola.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_off0000b831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB831 11064 bytes
SHA-256: 7f7cb26d1e6b16a50f87b11f14495745385c40c7a9978beee85abb3be2215db5
font_01_sfnt_off0000d1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C2 19180 bytes
SHA-256: 9e93761039f5daed85ddbc84ffce41068c96e2e8c318948ab203e6bd6bb1699a
font_02_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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