Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c165c471bd11324…

MALICIOUS

PDF

76.3 KB Created: 2021-05-12 12:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f80593199a5be737f683615ab5a9d984 SHA-1: 223dcfd6b193fb29776905418a04c40b4877fd5f SHA-256: 9c165c471bd113249ef94b4e82765dab4afa5bb17cefdb2e8483f56a614f8d55
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to a lost safe key, directing users to a URL that likely leads to a phishing or malware download page. No scripts were extracted, but the overall structure and URL distribution suggest a phishing campaign.

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
  • 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://dugedepap.ru/strik?utm_term=what+if+i+lost+my+sentry+safe+key PDF link annotation
    • http://nanolenka.xyz/xoxesinimatenojerije36y4q.pdfIn PDF document text
    • https://zetapowopes.weebly.com/uploads/1/3/0/8/130813904/setogel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462985/normal_60679eb815547.pdfIn PDF document text
    • https://rusipowesurajuk.weebly.com/uploads/1/3/4/5/134520473/golerodexodinatetir.pdfIn PDF document text
    • http://nivekux.iblogger.org/bollywood_new_video_song_site.pdfIn PDF document text
    • http://zoo-taxi.site/24230018807pqpr9.pdfIn PDF document text
    • http://tuzitiniviwodu.22web.org/html_link_to_bookmark.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420014/normal_60048073256f2.pdfIn PDF document text
    • http://pifezix.22web.org/brave_browser_apk_version_history.pdfIn PDF document text
    • https://wotutokope.weebly.com/uploads/1/3/5/3/135315373/8d63a.pdfIn PDF document text
    • http://biolinkus.me/dicionrio_de_filosofia_abbagnano_download4l80e.pdfIn PDF document text
    • http://orbitan.fun/pisivobufetodonepasumi5kppw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448744/normal_600804d0cd0be.pdfIn PDF document text
    • http://carishr.com/kizasebozek79kn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gijuvove.epizy.com/graphic_design_software_free_logo.pdfIn PDF document text
    • http://jemaloweveja.rf.gd/26746930128.pdfIn PDF document text
    • http://jibovofafef.epizy.com/17666110027.pdfIn PDF document text
    • http://gudanomakorake.epizy.com/59255327924.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE022 4972 bytes
SHA-256: 4e0f0c1ddec1f74c7c27ead3564179627736c743fef02eff8cb27a37c4d5a64e
font_01_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 10696 bytes
SHA-256: 7c54d979cfc467455fbbe4c33c3a3c4edd023c17f45e86564a4b96df608ef350
font_02_sfnt_off00011591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11591 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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