Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e34553cadbca4a2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-24 08:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3d0c1685fb77b31042fb758fb4d8258e SHA-1: 82fef1c874f91c1c54d6e13f52ef3d9ddaaa3885 SHA-256: 0e34553cadbca4a23896c04fe89cbebd9537a24a431c8062b0c31088e3702d0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by multiple heuristics and an ML classifier, specifically identified as a phishing trojan. It contains numerous external URIs and embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to host malicious content. The presence of these links indicates an attempt to direct users to potentially harmful websites.

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://crysiq.ru/uplcv?utm_term=gta+5+lite+android+apk PDF link annotation
    • http://changwontour.kr/FileData/ckfinder/files/20210910_C1094D7806AA828C.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/99982257583.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/64635043139.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/23419815157.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/putarabapamudonuka.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/wugamewipojupuvewuzoki.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/tugaxozudapevu.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/katapezed.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/57197761271.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/67017060759.pdfIn PDF document text
    • https://pindimana.in/uploads/file/16998016648.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/riserurevolega.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/timegesuxo.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/88742757990.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210907003143.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/4329997537.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/29030576460.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/49592719385.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/nokex.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/disebakixe.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/12946358971.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/gupudigovuw.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/27598133233.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/runanodimagosoxaja.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_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 17216 bytes
SHA-256: 6ac73e5b6661de2db9109d30f2ef569f6d1650c61e49911218d948f2742298e5
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 10480 bytes
SHA-256: 8ca92c7c676aaae5368e653f12d38c0cbe472073e729de0ae2fdfa03b82c1f1a

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