Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12cdf9085480342…

MALICIOUS

PDF

75.5 KB Created: 2021-03-30 06:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 09806272da1a32aa3af0e212435ce4f0 SHA-1: f20c53c4fb7337d013ddadfb121a869788e7b10f SHA-256: c12cdf90854803422f32d11489d057f9398366c7b7465c8df788419aef18df25
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=how+to+remove+stand+from+samsung+curved+monitor+c27f396 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375342/normal_5ff5a5e961992.pdfIn PDF document text
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/warukodirudalofariv.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/nomafivonulizu_dosizi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372104/normal_5ff4a5ef00436.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/beats_solo_2_wireless_change_battery.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481673/normal_5ffc4978c5106.pdfIn PDF document text
    • https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/xabezolajod.pdfIn PDF document text
    • http://toreret.scienceontheweb.net/alter_ego_5_cahier.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485305/normal_5fe9059259ccf.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/biodata_for_marriage_muslim_boy.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/ifAf8cX/toolbox_for_minecraft_pe_edition_ios_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_5fd63602617b3.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/2868751.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/KjdMphb/rofusofajaloruweponob.pdfIn PDF document text
    • https://cdn.sqhk.co/ninuxoti/ejajeq1/13490373456.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/IL8XibR/field_hockey_teams_in_california.pdfIn PDF document text
    • https://doxidadawod.weebly.com/uploads/1/3/1/3/131379698/lenabedibopa_kutuledodu.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/617ccf53-b9e8-467d-b0c6-d2aa7c54dd22/sidojesageviwoposil.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/what_are_the_symbols_used_in_lord_of_the_flies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6627ff6-c996-47cb-adbb-80fb53de3028/dujotif.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/wemasazuxuwonukudamowufu.pdfIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/78050032308.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 6108 bytes
SHA-256: 9112e78d256085aa9d3f6f1055fae1dad482cf96e063e0bd26b3252edabf944d
font_01_sfnt_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 10776 bytes
SHA-256: 2dadaf7ce92f4ec11596362b06b650bac35536c94f7f3b1846f56ec77e3d98cb
font_02_sfnt_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501