Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0df781ce212ec72…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 17:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9991b480f692200edd18040c689b69ab SHA-1: 4d7d9cf3437a4279b858c627c457a5623a92d734 SHA-256: f0df781ce212ec7291e45fa248126761503e5e41c56aedbc87fd5e8839184cfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL distribution strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://baovephuongtroi.com/vietkiendo/upload/file/99024224021.pdf In PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/28496811758.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/22735742749.pdfIn PDF document text
    • https://kermanrooz.com/img/files/93060156823.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/bisonofizikemani.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/68329212773.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-6/20210906043326786164.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/kiporiwoz.pdfIn PDF document text
    • http://namngonviet.com/user-/files/21135892023.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zalilagogujexadodi.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/lonotevupo.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210907_A29723CAF13A5975.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109110819013974.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/texixubosa.pdfIn PDF document text
    • http://labotinnghia.com/img/files/727004104.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161356b4d1e364---4922202091.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/sanulelef.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/bedexa.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/vijewoz.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/71213905631.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/wosepowex.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210909_62C6946FE4612F74.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/nanut.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/23575344548.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7b6093f1---96997796383.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/32336898523.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/13706829455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+offline+rpg+games+for+android+2021PDF 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_off0000e775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 11188 bytes
SHA-256: 7c33d96100aa79581cb2bdf125e6189e95c04183a046ef34ff81516f5820c39a
font_01_sfnt_off00010185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 16932 bytes
SHA-256: 7f7efe7ebb3f2fae095a7e8a25b1b9738f2e7bdb3f4ec9c27ef66fe575156841