Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6b40955e2b410d…

MALICIOUS

PDF

77.2 KB Created: 2021-04-02 15:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 87c73e6902136f518edb2388b750345b SHA-1: 2a7053cba9ebe2a96a16e503966201a8eb137fb7 SHA-256: fe6b40955e2b410dc8489524403439e84444185284ea159ea3af06fff89cd49a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, many of which are on disposable hosting, suggesting an attempt to distribute or redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a 'Honeywell wifi doorbell manual', likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://golowaki.ru/strik?utm_term=honeywell+wifi+doorbell+manual PDF link annotation
    • http://sfr-webmail.com/new_tamil_movies_hd_songs_2019dcyq4.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/hiknSHX/2160250007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_60180b768a49b.pdfIn PDF document text
    • http://euromarket.pro/mekokukavojef2qug.pdfIn PDF document text
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/4f7d6c8.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/RgdDjjA/madagascar_surf_n_slides_freedom.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/Xjbjgib/lords_mobile_pact_4_research_time_calculator.pdfIn PDF document text
    • http://ukranews.icu/smartsheet_dashboard_example45yrf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388280/normal_6059f4572b2a6.pdfIn PDF document text
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/2602538.pdfIn PDF document text
    • https://nogurutofuxuj.weebly.com/uploads/1/3/4/5/134525281/mijemuxekorimanazew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf7a586-95ed-4135-b7d6-fb13106ec502/the_hobbit_download_in_isaimini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b734766-f39a-42ac-92f5-e31dcbaf8273/85366873914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b87f18f-7cf1-40de-a4b3-38eb08513e4c/rekosilezobibetev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c92bd80-b588-44c4-b142-adead3feaa21/99880040889.pdfIn PDF document text
    • http://xuwabofori.epizy.com/storyboard_template_google_docs.pdfIn PDF document text
    • http://zaritopewebo.rf.gd/cardiovascular_system_book.pdfIn PDF document text
    • http://wakunama.rf.gd/19650038997.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/92854329195.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_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 5168 bytes
SHA-256: e3a3130b11564409974ff2dc1d86e49a1e7de92d8d63171dc20e36f2630991b9
font_01_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 10836 bytes
SHA-256: cb0208638a101ced93b6e18a821c1553f50ef312e10762208a78e51b274fb5c2

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