Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b21fbcbbbeec129…

MALICIOUS

PDF

80.6 KB Created: 2021-04-01 02:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 101199cb3769cc24eea7aadf47a2f2b5 SHA-1: ec07cf76c156152bb699b3c318761124bd6f9600 SHA-256: 1b21fbcbbbeec129b1db84c08f14b9d0f48635b6951d568c200e32d7329ab525
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The document body, though heavily obfuscated, contains a string related to device connectivity, suggesting a pretext for the malicious links.

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://midufefew.ru/strik?utm_term=why+is+my+magic+mouse+not+connecting PDF link annotation
    • http://digosige.mywebcommunity.org/aulas_de_violo_para_iniciantes.pdfIn PDF document text
    • http://zokazurimila.mygamesonline.org/agenda_escolar_2020_para_imprimir.pdfIn PDF document text
    • http://opros.xyz/wojolelak91s5u.pdfIn PDF document text
    • http://sputnews.com/xonasugemiduniwunoxudknqa.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/jexinibox.pdfIn PDF document text
    • http://jobs-ingenieur.best/joxuvuwukedakefatesiffivdv.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/hdRiehj/63878344568.pdfIn PDF document text
    • http://workmonster.net/allegiant_phone_number_live_personp18yu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420924/normal_5fc759ce4130c.pdfIn PDF document text
    • http://flowerport.shop/xbox_one_controller_pc_wired_vs_wirelessx5h5m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_605b19690c92b.pdfIn PDF document text
    • https://cdn.sqhk.co/xagegegozi/jThhibI/63706888923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_6012f1a112b86.pdfIn PDF document text
    • http://accueilcmb.com/jixepemajijavvyo99.pdfIn PDF document text
    • http://durowan.sportsontheweb.net/vakexizezuwakikumev.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/yiakjbP/smart_cloud_storage_apk.pdfIn PDF document text
    • http://inter-kalinka.ru/993156043743nc3j.pdfIn PDF document text
    • http://istra-backwater.ru/excretory_system_worksheet_high_schoolhau52.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bafuwujix.atwebpages.com/paraphrasing_sentences_exercises_with_answers.pdfIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_f9d06bc37ec2416183ab6747cdefcc36.pdf?index=trueIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_4c5088f5965c474b86e4bad5cd433a58.pdf?index=trueIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_b3ca3aad0ad34fb28ed7e191f6a4dede.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_37f383e5976d4893bdf89c56a761820c.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_76c096b8c1d54a59aa01e67b29e003d3.pdf?index=trueIn 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_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 6168 bytes
SHA-256: 50bd8db5ff9a0f03ea6ac0366ab4ff273dceb6ff0c6101ac0faff1fd52ccc92d
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 5200 bytes
SHA-256: 29132c03ad2853151f1d19ff6ecad37e6b6a688df0ec7e119a0b3585c9bf9602
font_02_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 11108 bytes
SHA-256: 8fd914e5529f4afc0f64824a1e8c67273869403810cc059b45f262a274804a4b