Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3eb62fd368c4fac…

MALICIOUS

PDF

92.8 KB Created: 2021-09-24 11:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 97ae317fff1fae0796bf0d35679a4a1f SHA-1: 6430120663b19a0e7a919df36f1d701d6a8c0058 SHA-256: b3eb62fd368c4faca3d0ab05545113094c9aaec45da977d9ca6ad3ec679c96ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest that the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards a common phishing or redirection tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=ex+with+benefits+full+movie+free+watch PDF link annotation
    • http://doremimarlikinsaat.com/userfiles/file/4137607035.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/17921254219.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/16654296424.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/71680941768.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/pekulajuvobebine.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/dotuvuxopenug.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/rukujiwatopuf.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/fatajufifevoz.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/38140403530.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///kanukejomu.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/17012255845.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/33986772933.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/67584381039.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/2246413382.pdfIn PDF document text
    • https://netpage.info/userfiles/file/34964982021.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614664353578e---80694260540.pdfIn PDF document text
    • http://bociany.sk/media/file/62234175684.pdfIn PDF document text
    • https://tomas-music.com/contents/files/89391075334.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/puredujuvuxoga.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/86a3e7b0fd4f0f8266c4375e89df0e60/kenogivos.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/netuf.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/71012092801.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/sujifimifotegi.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_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 11076 bytes
SHA-256: ea580ca5888b21b434c818bb26e746f8bbe391412cf3728c5a2c6452ecd1017b
font_02_sfnt_off000136f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F9 18128 bytes
SHA-256: ac8342579d421de3f7598e1a6300e77dc7a7011e34e7adc1f96e377bfaf2551b

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