Malicious PDF — malware analysis report

Static analysis result for SHA-256 99667fcfd99ee274…

MALICIOUS

PDF

85.3 KB Created: 2021-02-15 12:11:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ed1eda99b74a84d7588431082f1f606a SHA-1: 040fbaced38bb86740cde38deaac00cd4a6e4e0e SHA-256: 99667fcfd99ee274f2bf8485363d3e7d6e95f049c83bfe29029765c46df598fb
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure and others hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific malicious link heuristics confirms the attempt to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=astron+vs-35m+schematic In PDF document text
    • http://reduslim-officialsite.site/suzuki_sv650_service_manualugbws.pdfIn PDF document text
    • http://kosixanadiguf.iblogger.org/favejafelafisiziropem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447466/normal_601ca857993cc.pdfIn PDF document text
    • https://mitabepomumo.weebly.com/uploads/1/3/1/8/131872015/3849063.pdfIn PDF document text
    • https://cdn.sqhk.co/nudabesawi/nhjfihr/sim_dashboard_pc_monitor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403543/normal_602096739c766.pdfIn PDF document text
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/6205dc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496378/normal_5ff0194eed174.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/ripewuwodamogok-moresirixav.pdfIn PDF document text
    • http://circulshtangcalip.website/rokuliposirixusats006b.pdfIn PDF document text
    • http://francobusiness.com/31390762733m4vth.pdfIn PDF document text
    • http://videohost.space/nizipebetoo4mys.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5fca59e0caa2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowugodaka.epizy.com/bgt_final_2019_winner_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/arya_film_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/pekalurabexinovorosef.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/anonymous_sms_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/16236827816.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_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 5376 bytes
SHA-256: c9fcd36ad682b07b4fe6c9d5c2b41b62de711d53794c1e21cf8839e5740daec5
font_01_sfnt_off0001223a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223A 11064 bytes
SHA-256: a97f8678fb2cc82d4ceebd790e8f255a899b73a7a1be8782235b57ce63c91a68

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