Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b5dc7186f6effe…

MALICIOUS

PDF

82.9 KB Created: 2021-05-03 04:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1aaa64d077bc263dd2e0630bbe476396 SHA-1: e8b1c16faf18383d6b72d74dcc9211a523b1b003 SHA-256: e4b5dc7186f6effe56921b9c2d79b62da0b72ccd655bddddb070d9ed2fb2c1e9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting and acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://kuzutuzo.ru/strik?utm_term=big+little+lies+season+2+episode+3+end+song PDF link annotation
    • https://lugonejiborin.weebly.com/uploads/1/3/5/3/135336075/63941cba464df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484818/normal_5fded8fc62ada.pdfIn PDF document text
    • http://muzolifuvekimew.22web.org/81034702296.pdfIn PDF document text
    • https://xuwirebusupedun.weebly.com/uploads/1/3/4/3/134379604/vetokofux-mogijegij-zekidupatukuve-mujagipovisaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465000/normal_6028fa3d2e4e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_604dc223d803e.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/cWv8FnU/zejuledu.pdfIn PDF document text
    • https://cdn.sqhk.co/suvezadamut/ggggfhd/tap_u_find_virus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_60564ceb363e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_5fe9cdd7774fa.pdfIn PDF document text
    • https://cdn.sqhk.co/zewuxumaro/hoqYf4y/vujoxobutip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403960/normal_605c938710f4e.pdfIn PDF document text
    • http://boviriso.22web.org/free_archicad_tutorials_for_beginners.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/3364918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_6013e9d7aec4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495251/normal_6002824e1c9bb.pdfIn PDF document text
    • https://cdn.sqhk.co/mubutuve/9hbih6b/baseball_vs_zombie_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454430/normal_604efb35ba9b4.pdfIn PDF document text
    • https://cdn.sqhk.co/xubodijixali/ibLidhb/mini_grand_piano_child.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fapuvonez.epizy.com/where_the_rainbow_ends_analysis.pdfIn PDF document text
    • http://ketoxuxun.epizy.com/bohol_tour_guide_script.pdfIn PDF document text
    • http://botetuvixomidiz.epizy.com/30098486177.pdfIn PDF document text
    • http://nizoduni.rf.gd/apics_cpim_self_study_kit.pdfIn PDF document text
    • http://riwekijeworore.rf.gd/92072007968.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 5164 bytes
SHA-256: ff227b2315f5295e6d9a9f69b772396d0d62e0e89edcf8c6d5333e50ef510d88
font_01_sfnt_off000109b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B9 11140 bytes
SHA-256: cd4a7ecc666e40279611f7dabe9b0b2453ac2a7b41728b65ae8332cf84ed8b9c
font_02_sfnt_off00012f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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