Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d3adc803681ddb…

MALICIOUS

PDF

80.6 KB Created: 2021-02-18 08:01:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 57e5c6becbb6ee7c5ff6d80c83a1a859 SHA-1: 9acc12fa1ec70cc1c149aa3fa1702ac600e14870 SHA-256: c8d3adc803681ddbd69a1612443e877a4349fc30d70469c4e3e2834d57215034
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it is designed to redirect users to malicious websites, likely for phishing or malware distribution.

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 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.
  • 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://leonvi.ru/strik?utm_term=julian+calendar+2021+holidays PDF link annotation
    • https://cdn.sqhk.co/revinoxu/jbhgLhj/47205777857.pdfIn PDF document text
    • https://jebopisozezir.weebly.com/uploads/1/3/0/7/130739828/8532061.pdfIn PDF document text
    • https://nasipowo.weebly.com/uploads/1/3/1/3/131383467/tapixelibev_xerovukixurafe_bonasaji_furedejujesuvat.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/dUggWij/custom_notification_ringtone_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/HfFdhib/larinuwomise.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/zgijghe/24476870840.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/Otof0ie/kung_fu_zombie_movies.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/sudutefa_gimalowope_wirekegatov.pdfIn PDF document text
    • https://mokugutareno.weebly.com/uploads/1/3/1/6/131606089/wigezaserarotisep.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/gjTxR2a/bluestone_pavers_home_depot.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/Eghyhdo/netflix_series_dark_matter.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/jhhiheR/yeni_turkce_pop_en_hit_100_muzik_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tepokubomime.rf.gd/sheet_metal_gusset_design_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/wobozota.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/360_antivirus_for_laptop_free.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_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 5444 bytes
SHA-256: 8bc3c58a809e3b2ffbdb1305325e9f30356b6671b1b583d573fae538a3062f62
font_01_sfnt_off00010fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 10956 bytes
SHA-256: f5d5f35cc8b7c6ece6eb287ef48d5ca32d04063b924582b6cf6758e221f3642b

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