Malicious PDF — malware analysis report

Static analysis result for SHA-256 663b9e1230bfdc2d…

MALICIOUS

PDF

82.4 KB Created: 2021-02-25 02:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7a5934082910cb894b6b974570c9bef4 SHA-1: f40bba81ceacac1a2471e53325519817bc7eb8dd SHA-256: 663b9e1230bfdc2db1ea5ca9afa1445d0993ad81edbeeae3755e0134f522734b
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://baarspo.ru/strik?utm_term=groupme+app+for+computer', are likely used to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

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://baarspo.ru/strik?utm_term=groupme+app+for+computer PDF link annotation
    • http://saxobupazes.sportsontheweb.net/como_trabalhar_no_consulado_brasileiro_nos_estados_unidos.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/kinefaripidixulofumekib.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/49363105944.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/ifSd9Vw/opinel_inox_knives.pdfIn PDF document text
    • https://wozaxopuvomu.weebly.com/uploads/1/3/0/7/130740129/texixuvegesijesalima.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/dell_v313_printer_driver_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/ariiftq/best_world_history_books_for_middle_school.pdfIn PDF document text
    • https://cdn.sqhk.co/selugijibix/u9zgiC8/gibatopinujilikasorevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5feb5d1bebe36.pdfIn PDF document text
    • https://josafobuwevaj.weebly.com/uploads/1/3/4/4/134464642/5b1b6.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/tamil_worksheets_for_grade_3_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/gd6SLXR/auto_spare_parts_in_japan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_5fd86ba8d55d0.pdfIn PDF document text
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/2442563.pdfIn PDF document text
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/d38af.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/how_to_use_total_gym_xls_attachments.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/xamimaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogivuwe.onlinewebshop.net/roxabexedul.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/pijetawanaxuxa.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_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 4984 bytes
SHA-256: f21df0c38df9b1148979e61b1dc5c6fcefcd18bb0213d74bdc3ce1bb298b5a66
font_01_sfnt_off000115ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EF 11488 bytes
SHA-256: 31bec465ca916ccd06991a743b51371bcf5db592b59b5444db54a295d968af58

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