Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b4fb5124dd5d5a…

MALICIOUS

PDF

81.9 KB Created: 2021-03-25 07:42:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 010acb5782f3d2a20717730da43c4b18 SHA-1: 67ae85734b0ff255b8f86d75c56596972dc6b028 SHA-256: c7b4fb5124dd5d5a8143a4d32f423ab74f5484c2fe0502606af6f6d9efd54b9f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/wb?keyword=english%20book%20author%20name%20list
    • https://cdn.sqhk.co/lefuwaregew/bWpjcgc/clumsy_ninja_kira_dead.pdf
    • http://ramuwesitavoz.mywebcommunity.org/19412504866.pdf
    • https://cdn.sqhk.co/jogeguzotire/jjjcwji/rinulitolabot.pdf
    • http://fijexojor.getenjoyment.net/support_vector_machine_books_free_download.pdf
    • https://cdn.sqhk.co/xefilelo/Sgjieij/lomutatorexabatanoma.pdf
    • http://ijmalan.xyz/elias_ancient_magus_bride_voice_actorvuel5.pdf
    • http://tapodozinojet.mypressonline.com/woten.pdf
    • http://xubanapirobula.mypressonline.com/wunufiwosodapumonipirafa.pdf
    • https://cdn.sqhk.co/tinodifozeza/MCIgjhi/fenovuda.pdf
    • https://cdn.sqhk.co/dutaxato/UOFUWhb/v_screen_recorder.pdf
    • http://reliables.ru/competencias_martha_alles8bonf.pdf
    • https://static.s123-cdn-static.com/uploads/4484806/normal_5fdd61240aecf.pdf
    • http://niwopofe.scienceontheweb.net/dreamstation_auto_bipap.pdf
    • https://cdn-cms.f-static.net/uploads/4503390/normal_604dad6a6b259.pdf
    • https://cdn-cms.f-static.net/uploads/4481406/normal_602028e4a03c6.pdf
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5fdf14328bdbe.pdf
    • https://static.s123-cdn-static.com/uploads/4481065/normal_5febc40217dc0.pdf
    • http://7lessons.website/cladogram_analysis_worksheet_answer_key380w5.pdf
    • https://static.s123-cdn-static.com/uploads/4481552/normal_5fcb472bc8930.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_371b6e65368c4a2cb5b67958057f1691.pdf?index=true
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_6ded87e8ad6d454aa91af6b87483c833.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f508.bin
947c5137b49c55f4b8f262d30eff7ea1db9e8a17b70391d7f861a65509a7b295		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 5144 bytes
font_01_sfnt_off00010655.bin
cc269dd714f799611e8088e3f9aa5aaaf8ea93e34ede3c0747821b36fed854b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 11180 bytes
font_02_sfnt_off00012c59.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C59 4324 bytes

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