Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc01c7b45a46113…

MALICIOUS

PDF

71.4 KB Created: 2021-10-02 12:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2247a353c8be8980fe57809b4137b8df SHA-1: 826663e8c00ffecb272d0e5bbb9e9435212462fc SHA-256: cbc01c7b45a46113b9e2bb2c43b80652ae7c79d7741fbe0eaabd185a356ef461
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this document being used for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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.
  • 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://endobible.com/userfiles/file/dopotarozegi.pdf In PDF document text
    • https://cursosadistanciayonline.com/medios/files/65228254022.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/vefazaxajumuseniripugas.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109131119103579.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/lufoxesu.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/lisesowaketoxabodetu.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/63332561924.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/vuwixigolip.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/1122922430.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/65612779347.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/zilebexodotofobotinovem.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/fokutefeludupowovop.pdfIn PDF document text
    • https://bdata.vn/upload/files/wimilurevajitapiwaveni.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/kofarotavurufifaxut.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/38785594901.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8816b8aaaf158ab2a7da90fbb8a46c2d/3995714684.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/63507603645.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/sesitaso.pdfIn PDF document text
    • http://compsult.net/userfiles/file/gedemo.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/wituku.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/ruboledojuxinopozoriro.pdfIn PDF document text
    • http://goref.ru/files/file/tigopoki.pdfIn PDF document text
    • http://balatonfurediallatorvos.hu/userfiles/file/vujawiw.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/zujoriko.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/91913835691.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/44355386884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=authorization+letter+for+passportPDF link annotation
    • 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_off0000b455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 10596 bytes
SHA-256: cef7a12f8d0b0b59119d086d76c3db21d6701ad0a8df5e83f1182c32cb736eda
font_02_sfnt_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 17256 bytes
SHA-256: 83d9c1f4d21b2e58acca8bd9f68efb52c83bad6a32b84b0e40a846b26b490a03