Malicious PDF — malware analysis report

Static analysis result for SHA-256 af89578b0b3127a0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 21:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f01f6416b020b27285f26a1881c9436 SHA-1: 31379140cb448b8a29d4786ab30c7657b7130945 SHA-256: af89578b0b3127a09818997a1336d72094a57c0e239cbb7e94ff48741ed77eea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using link farms on disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://transturist.ba/ckeditor/ckfinder/files/files/88512640173.pdf In PDF document text
    • http://dija.lv/public/userfiles/file/45029102390.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/25557275424.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/mutitakitorerovurabuzaluk.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/50961703479.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/nadubepo.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/38476441428.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xozedufetiwoderosidizu.pdfIn PDF document text
    • http://grimastone.ru/files/xulexuvonusadivim.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210912_115633_200.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/97842792662.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091018353062.pdfIn PDF document text
    • http://keacg.com/upload/files/23013127531.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/vapadinibuvipilazidiwo.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/28021175303.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/7930312256.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/gufave.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132076a961f9---61741807619.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/63093586861.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df9f9e373b---92285695842.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/safajutoxiwunedimodasin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=i+told+sunset+about+you+watch+onlinePDF 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_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 18168 bytes
SHA-256: 66b77aee4725a737eab3ef601fb6b8590f8ab6732ee811344b9a7011c8422f96
font_01_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 10760 bytes
SHA-256: bda50ed206592495120a72f21979bc76aee994d5bc23294420356c7d175037b4
font_02_sfnt_off000126b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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