Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff98a95902b2e488…

MALICIOUS

PDF

78.2 KB Created: 2021-03-22 23:02:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1213cd209f93c072647e4e56507b344e SHA-1: b86d07de681e2ed7b1d447a067f2804fb3467cfa SHA-256: ff98a95902b2e4883dbca142366b116101151550c5f4d2747d3bdc176403f6a1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to game guides and application names, likely serving as a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/wix?keyword=karazhan+guide+icy+veins
    • https://fogunovavak.weebly.com/uploads/1/3/2/6/132681822/sibapisitenijanewog.pdf
    • https://cdn-cms.f-static.net/uploads/4462093/normal_6055337188fc5.pdf
    • http://towonededuv.medianewsonline.com/livro_clara_dos_anjos_lima_barreto.pdf
    • https://cdn.sqhk.co/merisipugito/fSshbWv/tank_force_modern_military_games_mod_apk.pdf
    • https://cdn.sqhk.co/tegiriwepaj/drZjpie/91782887149.pdf
    • https://cdn-cms.f-static.net/uploads/4447089/normal_60148f3d01cfa.pdf
    • http://lumufurisazela.mywebcommunity.org/pudixari.pdf
    • http://midarujiwuvi.mygamesonline.org/rivitovadiw.pdf
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/dudowegojaj_guposotagogipor_vopomo.pdf
    • http://tezijexipilimo.getenjoyment.net/poganedowupagabomatuveko.pdf
    • https://cdn.sqhk.co/guzufaseba/geR03nE/c64_javascript_emulator_download.pdf
    • https://cdn.sqhk.co/sifajoxojif/nRjfVoQ/foxasemobuwekijemoxemuvi.pdf
    • http://sowipilarow.mygamesonline.org/ruvorom.pdf
    • https://cdn-cms.f-static.net/uploads/4445739/normal_6012414a57dcb.pdf
    • https://cdn-cms.f-static.net/uploads/4496372/normal_601809b82c02a.pdf
    • https://static.s123-cdn-static.com/uploads/4422908/normal_5fed2f8c3157c.pdf
    • http://xepidenad.scienceontheweb.net/what_are_some_examples_of_utilitarianism.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sugowubuf/69908149955.pdf
    • http://sukokovevaz.atwebpages.com/base64_image_to_php.pdf
    • http://vovojoj.atwebpages.com/2501586759.pdf
    • http://sabiwilurase.atwebpages.com/microsoft_senior_program_manager_interview_questions.pdf
    • https://s3.amazonaws.com/xepululejiwof/3936712061.pdf
    • https://s3.amazonaws.com/tarizirefevifab/autocad_download_manager_not_working.pdf
    • http://pelebirepopo.onlinewebshop.net/jadefifik.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f457.bin
455f2eda8183175547586e6854765704433e385bff0bc9d7e9d638a3d8f23eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 5352 bytes
font_01_sfnt_off0001069f.bin
435108cc8445e9750d86e75ba0da35f044ce10f183db46ee6a7236375757a3da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 10856 bytes

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