Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fae8a43f498781…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 11:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 515456d2581b7719de2917daaead83a6 SHA-1: b72e8645a654abf5b0445f88eb6a3a20af03a6eb SHA-256: e0fae8a43f498781d9904542012eb419c8cacbaf09a43d0a5e37aaa2fd362036
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of numerous external URLs, many pointing to disposable domains or link farms, further supports a phishing or malware distribution scheme. The primary attack pattern involves using the PDF as an attachment in a spearphishing campaign to lure victims into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=a+love+so+beautiful+ep+1+eng+sub PDF link annotation
    • http://exim5.hu/_user/file/49803880666.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/55209542515.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/36824570241.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/geruramolugelibazuroruxiw.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4c2054b409f17b6858b7409d6c761aef/36911990453.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/17623837160.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/48e7daab2280ffd776c8d4da2f809cf6/81429799658.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/vimojilulediz.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/78238756460.pdfIn PDF document text
    • https://ksboutlet.com/file/files/fowujalaw.pdfIn PDF document text
    • https://mallenmediations.com/mallenmediations/images/userfiles/file/23226614429.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/kalenodipovedenifodubine.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/37441283018.pdfIn PDF document text
    • http://p-energo.ru/content/file/vudizaruj.pdfIn PDF document text
    • http://eoffice.erdenet.mn/asu/editor/files/noduzibipivufug.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/gugupoladuf.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/ruzadogodetokewatofozi.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/63340037328.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/20129856218.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/23804711617.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/36561318567.pdfIn PDF document text
    • http://zaiger.ru/img/file/86113274153.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/jupedawelaxuf.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_off0000b219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB219 10772 bytes
SHA-256: 76522ed87299b04e49e1226451f4c52e3ef6da19a52707780d7fd15f1f6c750a
font_01_sfnt_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 16076 bytes
SHA-256: 141a2e9ee4d2d02054a74da9da8259ebf87167b2e4d1869fe099fc263df02c9e