Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c99796c36aac84c…

MALICIOUS

PDF

66.1 KB Created: 2021-02-17 00:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: ad448903641c990edcb475e6e85ead5e SHA-1: d539d1b479c4ec640d50d35eee11e53ac182f6f0 SHA-256: 4c99796c36aac84c9824317edd2210da4b71895a1bec73b1b10fc324643a7239
186 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://druttle.ru/wix?keyword=discovering+french+bleu+workbook+answers PDF link annotation
    • http://sandiego-podcasts.com/vector_mechanics_for_engineers_dynamics_solutionsaf11d.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/jhiijeU/8676116388.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/f9jgXmn/loud_voice_ringtone_app.pdfIn PDF document text
    • https://falijufik.weebly.com/uploads/1/3/5/3/135349852/jekelefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486565/normal_5fe8fd1c1a3b6.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/WqTBAhe/68844985381.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/ghgemzS/tamil_new_ringtone_2020_zedge.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/geijrgf/slingshot_vs_zombies_mod_apk_no_reload.pdfIn PDF document text
    • http://uplrezina.site/minecraft_tu11_tutorial_world_downloadbbbjf.pdfIn PDF document text
    • http://freshnatur.fun/traditional_costing_system_vs_abcxyr99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_602822f78828f.pdfIn PDF document text
    • http://auto-fishing-rods1.club/fufugirafilug8spgz.pdfIn PDF document text
    • https://kakujaboregoj.weebly.com/uploads/1/3/5/3/135341432/1377723.pdfIn PDF document text
    • http://juvozukatug.66ghz.com/prince_george_of_cambridge_school_uniform.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500186/normal_601ec6ff608f7.pdfIn PDF document text
    • http://furniture21.online/luvuravawoxelevitunumuva2zq6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pidosowot.epizy.com/image_animator_app_for_android.pdfIn PDF document text
    • http://poresiz.epizy.com/report_power_outage_southern_california_edison.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A6 5500 bytes
SHA-256: 7751c17801255573ef2818c7a74989f72375ddf203900fba650d304f7cd5cd52
font_01_sfnt_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 10372 bytes
SHA-256: 5800643b46845b45f033f9f8937522c3a6a2ab0331b580c9c9c095b74610535a

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