Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ceb54d0fc9404ca…

MALICIOUS

PDF

76.7 KB Created: 2021-09-11 11:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: caf8fa94faa011a51980bb57a7e9c46c SHA-1: 22744f1a37e6fa0461a99b782c42bb80909dcd58 SHA-256: 7ceb54d0fc9404cae03407268b2f7d31e3228be98eb271f83677d87bb03c512d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, with a critical detection for Pdf.Phishing.Trojan. It contains embedded JavaScript, indicating an attempt to execute code within the PDF viewer. The PDF also contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure to distribute further payloads or collect user information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://uklearningnetwork.com/userfiles/file/fofazebonazuxe.pdf In PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/zasexusadufirosepubatonem.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/11011767769.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/mazufuzu.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/61905782126.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/65660092996.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/35013720890.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mepefakifusap.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/xupuxevovige.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109060157204894.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/wafari.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/85864773119.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/84792462973.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/8806375566132a9fda2286.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/godomeratogofu.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/3rier76mdi9lchhki80tuijgek/tobidezidav.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109031856137889.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/zedizipitida.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/sininokezugiwatuxotapopen.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/3798518592.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/923481949.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/fedarulerajajin.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/5135818075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=resident+evil+0+apkPDF 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_off0000c3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A8 19068 bytes
SHA-256: a07031fcfb01be1e36349257272aad6b507e6cf9cd5b5a5aff8e355b2494b8d8
font_01_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 10488 bytes
SHA-256: 4bfd5729c12f2df360d9bf03d555adcd07cdb1f73b27cb336295e1835f0a5a92
font_02_sfnt_off00010db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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