Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a71a8096a95f2dc…

MALICIOUS

PDF

76.8 KB Created: 2021-02-18 07:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3f70da4f4b43181c89397fb3a0e21914 SHA-1: f4c8c594fe09816526bd6c2f1a4c4076dd012490 SHA-256: 2a71a8096a95f2dc7d0a5307350ea5de96f0209150d1b9eb01230320eee93f8b
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a notable heuristic identifying it as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=what+does+for+dummies+mean PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414336/normal_601647cb67f6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_5fd3242be7684.pdfIn PDF document text
    • http://lekanevakima.iblogger.org/fupin.pdfIn PDF document text
    • http://fisidunetozusi.iblogger.org/82495597904.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/y2ialf4/76024191088.pdfIn PDF document text
    • http://perinolaguzur.iblogger.org/85922256081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481828/normal_5fe66b50b9967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408593/normal_60018ec7db149.pdfIn PDF document text
    • http://sizegivip.22web.org/guided_meditation_lina_grace.pdfIn PDF document text
    • http://zatuzosej.iblogger.org/h_m_size_guide_uk_jeans.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/ihixSgc/offroad_outlaws_update_2020_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/gC9ed3q/empire_at_war_remake_galactic_conquest_multiplayer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miwofalixi.rf.gd/google_form_theme_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/saltwater_blenny_information.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/41615580023.pdfIn PDF document text
    • http://roxonolabixatox.epizy.com/nedebuxunowibulasavi.pdfIn PDF document text
    • http://lokuvutifinulef.rf.gd/93179594286.pdfIn PDF document text
    • http://vulikoviluxugu.rf.gd/agri_college_in_coimbatore_application_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/hp_15_notebook_pc_bluetooth_driver.pdfIn PDF document text
    • http://tivogowajap.epizy.com/stickers_png_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/vusosanofulokineperupodu.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_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 5128 bytes
SHA-256: 91578cfec6f3516b297ab0531f2b76ce8de9f362c63fe6ea0560c69081968990
font_01_sfnt_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 11236 bytes
SHA-256: cd3743a8933346cf1ae027936d12161c6a9894fae6f3cf011ea359439f102589

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