Malicious PDF — malware analysis report

Static analysis result for SHA-256 955c1877426f1df2…

MALICIOUS

PDF

94.9 KB Created: 2021-01-22 22:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d96ea34d35320a0dfa964633dc52413f SHA-1: 8aa6ff445d690c47f72c2afb9167511caa7eaa03 SHA-256: 955c1877426f1df26101ef10c554d1e88479c0c4859a30acd52339c6983aaba7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. One prominent URL, 'https://trafftec.ru/aws?utm_term=laser+cutting+machine+sheet+metal', is presented in the document body, likely as a lure.

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://trafftec.ru/aws?utm_term=laser+cutting+machine+sheet+metal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476274/normal_5ff33ba15bae7.pdfIn PDF document text
    • https://site-1175201.mozfiles.com/files/1175201/67914424855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd65607ea695.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/6mbg8G6/divavevanigofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_5fdab152dad6e.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/jbyuCCh/1943_deadly_desert_premium.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/cwRJW0j/find_my_friends_reporting_wrong_location.pdfIn PDF document text
    • https://cdn.sqhk.co/dulinifijal/wihRjS4/crafty_craft_for_minecraft_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gipagigo/c985cih/the_hangover_2_soundtrack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_5fe9d2427251f.pdfIn PDF document text
    • https://site-1185312.mozfiles.com/files/1185312/98489918883.pdfIn PDF document text
    • https://cdn.sqhk.co/rapekerokemo/jdbhjig/knights_of_fantasy.pdfIn PDF document text
    • http://mimasajikataza.iblogger.org/agile_project_management_kanban.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413696/normal_60095f03be4ff.pdfIn PDF document text
    • https://site-1216840.mozfiles.com/files/1216840/85131099780.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vazisi/ethnicity_information_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/present_perfect_versus_present_perfect_progressive_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/financial_report_analysis_meaning.pdfIn PDF document text
    • http://minirulo.epizy.com/megikeluxenipab.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_off00013655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13655 5156 bytes
SHA-256: ea228e34bd978b1ccedd68d9a4b53be6b04cc36ec0b7912492ea7b0c631aaabe
font_01_sfnt_off000147b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B4 11260 bytes
SHA-256: 90026a1afdefb5cb87647de55ecd48680e99b7086239e6d88e5126001a3d81b6

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