Malicious PDF — malware analysis report

Static analysis result for SHA-256 163675b91c17f9d9…

MALICIOUS

PDF

71.3 KB Created: 2021-02-07 15:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ff1da82f340e9a51bd576ea2838da111 SHA-1: 2d180c9d7b236e3123aa0b19754096d8993aebd7 SHA-256: 163675b91c17f9d919a43555eede1e3bd3aa4a2db264cb68761ebaa58de20433
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is part of a network of such pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wb?keyword=figurative%20language%20poem%205%20sleep%20worksheet%20answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382406/normal_5fdcdde8316c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370097/normal_5fce878071039.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/25280157750cfp5x.pdfIn PDF document text
    • http://servicesforsupport.com/nucleo-f103rb_user_manualnboro.pdfIn PDF document text
    • http://creamwalls.space/timefegowixumujalatotoku0.pdfIn PDF document text
    • https://viwifigejemi.weebly.com/uploads/1/3/0/8/130814408/lujetudumukavu-pilogume-xuzexet-nudigu.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/gopon_derumefuzilu_fufakibubuwom_dasoromejap.pdfIn PDF document text
    • http://shop-onlain.fun/electronic_structure_of_matterbe65v.pdfIn PDF document text
    • https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/vupakujo_wunetizakokub_guperemos_xibutugekiti.pdfIn PDF document text
    • http://mon-cmb.best/62805228573gkqj5.pdfIn PDF document text
    • http://osthondroz.com/make_own_name_ringtonegg26i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_600f73893b50a.pdfIn PDF document text
    • http://bionatur.space/arcane_quest_legends_full_apk_moda3nex.pdfIn PDF document text
    • http://idslim-italia.site/68453208409e0r18.pdfIn PDF document text
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/boruvagelil_mizamiv_sedubuwobomipa_pikavixabefugud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 5528 bytes
SHA-256: 3c02ea57d0936c1ffa94f2c7456e6d4fe99a669baf26ed10098a1d465f374215
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 10044 bytes
SHA-256: f6dcdec5926dde9e895744573e4963e6fc422739cd743ae2796c259f32d4065e

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