Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e00502eb29c5702…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 10:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 826e7ae79dfa3d88b27909eda8f7bf4b SHA-1: 0890ecd2b78f69601928dc5e09edeb2fb1621cfa SHA-256: 7e00502eb29c5702d5f5192576dacb8d7c5e7aa3aae253a154c81591b875dcaf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also hosts a large number of external URLs, many of which appear to be disposable or link farms, suggesting a phishing or redirection attempt. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=pikachu+live+wallpaper+for+pc PDF link annotation
    • http://china-hold.com/UploadFile/file/20210914120328865.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/96222137365.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210925_130449.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/lisiwutibeke.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/10506775652.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f63ca57c1---62025562390.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/94549259314.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/93959453680.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/98288274874.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/12247919217.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/zuxilifirefeliwoboke.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/jadulilixupowexig.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/butaxuxemodidevibavug.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/54578452896.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132247b1a80b---lojazifipijikezotapurixe.pdfIn PDF document text
    • http://orem.mn/uploads/files/mesunoluwufabas.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/20763355764.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/1847696502.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/81618196261.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/73561200102.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/86781406513.pdfIn PDF document text
    • https://emenu.hu/editor_up/46595316223.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/99039120007.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/96403750482.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/wotokujafod.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_off0000b38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA3 10552 bytes
SHA-256: 69a57de36b5cf4de6a5a2cf4c0bb4aeba484554ac51066fd3125580f917d1cda
font_02_sfnt_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 15684 bytes
SHA-256: f233b33adf70041e5a1efc95cc611d65674f83f5ebd20d9f83d0d38aaa9e3ebb