Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bc9c12a4e7de1d…

MALICIOUS

PDF

85.6 KB Created: 2021-03-26 18:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a0f38a231657935f4cfd3e6fcc4507c SHA-1: e864bd0dfe48c62707b7765775c3fa6fcbeb8c01 SHA-256: a2bc9c12a4e7de1d2f90afa265b56be1050a5432a86d1a6f8e041a3962a47faf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous URLs and the 'PDF_SEO_LINK_FARM' heuristic indicate the document is designed to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=geankoplis+c.+j.+transport+processes+and+separation+process+principles+4th+ed.+prentice+hall+nj+2003
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/6f2a75ba.pdf
    • http://mosomupusafebin.medianewsonline.com/examen_toefl_itp_gratis.pdf
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/8035434.pdf
    • https://cdn.sqhk.co/kakapoxavu/gffs1kl/25262897881.pdf
    • http://buloshnaya.site/959988499589i25.pdf
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/97014d9d.pdf
    • https://cdn.sqhk.co/kinemefuwa/hciaCgi/80124689685.pdf
    • http://rimiripa.mypressonline.com/61663641817.pdf
    • https://penoruzeni.weebly.com/uploads/1/3/4/1/134132400/fokorutuselawo_jobik_pajejadowopu.pdf
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/fivat_xofumogoganafom.pdf
    • http://fesotisifofil.mygamesonline.org/modified_barthel_index_of_activities_of_daily_living.pdf
    • http://job-finder.space/2233574910x26s8.pdf
    • https://cdn.sqhk.co/pebekaja/nWIhgic/personal_care_assistant_jobs_near_me.pdf
    • https://mikudone.weebly.com/uploads/1/3/4/3/134370159/6234939.pdf
    • http://cheapestshop.xyz/zevivobavasaxofumv80x.pdf
    • https://cdn.sqhk.co/tefazaturar/Hgigfii/90888563456.pdf
    • http://diluzadumavotux.getenjoyment.net/buffettology_mary_buffett.pdf
    • https://tilipigenetuwa.weebly.com/uploads/1/3/4/7/134770736/6836116.pdf
    • https://cdn.sqhk.co/gujowaxexag/ghhemhi/download_smart_youtube_tv_apkpure.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_0ed85c9240b44a329360555f480a5632.pdf?index=true
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_57790162ffe7447dac444183ad544b09.pdf?index=true
    • http://bobixupeto.myartsonline.com/ccna_certification_exam_questions.pdf
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_b082a015fa7d45fb8c92345e2c21154a.pdf?index=true
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_15e5ce0b48664574a6a820986fab6d71.pdf?index=true
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_81bf0a221f324102baf64ff70e38774a.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_off00010098.bin
f8c071316905e8eb15b67159ed2633166139382cfc4cd4728697d1dac8946f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 5676 bytes
font_01_sfnt_off000113ec.bin
788f69ec1319f37e4b9286622e65e6a010d3fee4af531ca1d4ae755c816122c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113EC 10912 bytes
font_02_sfnt_off0001393d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1393D 4324 bytes

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