Malicious PDF — malware analysis report

Static analysis result for SHA-256 5767751f3ed4a7b2…

MALICIOUS

PDF

91.6 KB Created: 2021-10-06 11:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e9370e9803df46738d06ba4bf6549d6f SHA-1: 62aeb468e3490409189bdd2b224dafb5f8a4dac0 SHA-256: 5767751f3ed4a7b28d051d166002086b63bfb61fa80e5acece3b003cbca594f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a large number of links on disposable hosting, likely to obscure the true malicious destination or to host a variety of phishing or malware distribution pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pobierzplik.pl/uploads/files/72000371785.pdf In PDF document text
    • http://haisushitogo.com/uploads/files/29925092499.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/24588196039.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/974ndege8gdb7l66bbj0lnkpc3/56679439376.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/lepujedo.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/51478206746.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/13939765695.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/60093416875.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/79500856968.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/kupojuninisu.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/bulan.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021100413092080.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/8558535617.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/fujafotowa.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/91816079757.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/pusavagodeguk.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/vubifateburu.pdfIn PDF document text
    • http://cityyeast.com/userfiles/file/91009124101.pdfIn PDF document text
    • http://naso10.com/userData/board/file/25539911617.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/23651481303.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/kukefamafetimatatekus.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/wofevesijireluwuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+make+money+in+your+spare+time+pdfPDF 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_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 10996 bytes
SHA-256: d7d7a59159a35aa9069ebd8c5bccc43d032fa6a2618bb2206cb5b8956d3cc7ee
font_02_sfnt_off00012e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E20 19304 bytes
SHA-256: fc948b1c064bbea27befa40877e6addf5f3ed1cb9d268547f1842f1442017dd3

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