Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd10442621661a73…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 11:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a7d009c856920638b0986f2dfd2a949 SHA-1: ebcba278f85c23de943cd9fadf72057789e41bc5 SHA-256: fd10442621661a7321ef2a53f0af4d7ad045c3231149eb7d8d53aca79126b34b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=dragonball+dokkan+battle+jp+mod+apk PDF link annotation
    • http://jpsacademy.com/slbdavbatala/userfiles/file/dubezajasozufurezifal.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/fupozopunobelibikekax.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///39112278321.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/11478750553.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/89954432715.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8ee4ff3c---43890594884.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210918032318.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/dinuditewupotugexa.pdfIn PDF document text
    • https://oasis-travel.ro/files/19568290395.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/regek.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/74314194056.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/181200408478.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/83687839005.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/kagumerewekelem.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/24281304572.pdfIn PDF document text
    • https://ccskin.com/geektic/files/98756476350.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161418f193ec0f---51302292753.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/koxolodibolapemesege.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/23999986232.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/63546991935.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/nimizagebubasifojo.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/mokusiputoxube.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/54905222628.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_off0000c01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82F 19216 bytes
SHA-256: 6a7719c03974532165c331717227f6e0d7e19a5d8651d24b6130abadf597ae8b
font_02_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 10836 bytes
SHA-256: 3264838aee43099488d6615abc70dd2b0c9d997cfadd02071c04dbcbcd175b3b

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