Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e965cbd0b56064f…

MALICIOUS

PDF

74.4 KB Created: 2021-01-30 05:35:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f098cbc51275cafa638ac5a4f3f60dec SHA-1: eed324707439453a6ca1981047ab7ef9d3d9e7bf SHA-256: 8e965cbd0b56064f64451f7f2735e6877595dac09aedc71cb74eac0abe54c175
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it's a link farm and has been flagged by ML classifiers and ClamAV as malicious. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/aws?utm_term=half+life+problems+worksheet+algebra+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5fdb8f7aa8a5f.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/5968113.pdfIn PDF document text
    • https://pukakanasosakum.weebly.com/uploads/1/3/5/3/135392678/e2b91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452199/normal_5ffe84d2ea46a.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/zBKBJje/dungeon_keeper_gold_level_4.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/keriziru.pdfIn PDF document text
    • https://pobubejafak.weebly.com/uploads/1/3/5/3/135314602/sinuzofakebepopafi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385436/normal_5feb2bcae8c60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/71016046500.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/dell_latitude_3400_laptop_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/97094067477.pdfIn PDF document text
    • http://wawuzir.epizy.com/management_information_systems_case_study_answers.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/66192859035.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/glioblastoma_multiforme_cause.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/booting_process_in_linux.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_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 5704 bytes
SHA-256: c3047a1fe93cf6886aa8d6788e917a1b2436f0c14bcc358fed3245d2f0f4e32c
font_01_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 12076 bytes
SHA-256: 11da06e2f9d4ac50f13cf39f2f5ff4f28c1e92ae4f85b4e659d3f20db2a97eef

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