Malicious PDF — malware analysis report

Static analysis result for SHA-256 be671a36751ffafb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 22:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6e2582b8914d2143d405b880bf51dec7 SHA-1: f0fff7c9f09ec45cac93009941fb1ab79d88e521 SHA-256: be671a36751ffafbf7e39837662a3a6aadbd80ed5adcf1a7dff32a5dbaf4b164
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or conduct phishing attacks. The presence of external URIs and the link farm heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=free+fortnite+apk PDF link annotation
    • http://lsneotek.com/ckupload/files/jobexilivase.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/82789648920.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/sakofetojuzulusuwatu.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/bawodi.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/17573210685.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/pibunulexovewir.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd81141de8---bitivatudufiga.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/96922197742.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/92970596124.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/59451849665.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/jagexizaf.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/votavedewaduvukiwidi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141ba628f870---dogofeleko.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/79875749213.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/24406465849.pdfIn PDF document text
    • http://xycrusher.com/d/files/22488363844.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/lowubesoxumaj.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/33258643000.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/66515057884.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/ninugukimexokugufus.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/netijopekujivosiwazivew.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/sepikamiwelivinuvexuxe.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/bolosenufadojiti.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/94473352913.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2076689415.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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 18336 bytes
SHA-256: 457dd10f0480e535b7d7b61c0c1d765cf6ddd4fa517ef2fa044e24b6a22ff7af
font_01_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8A 10204 bytes
SHA-256: 33eba3ba457a51bb12244ba4d2177378daf7c19c4a41e26e1dac3ab5026662da