Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fd86dde880cb25…

MALICIOUS

PDF

81.6 KB Created: 2021-03-14 01:14:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0e1a41298770f0134f84835506c1b169 SHA-1: 7ff52c5cad490739fa14462433d4ccd3eebc76eb SHA-256: e7fd86dde880cb2587cd3ecf88c4aa8bacfc20855681087589f69aa8d5707e06
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure malicious destinations. While no scripts were extracted, the presence of multiple external URIs and the ML classification point towards malicious intent, likely to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/award?keyword=br%25C3%25BCche+zahlenstrahl+%25C3%25BCbungen+pdf PDF link annotation
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/8a4476f8.pdfIn PDF document text
    • http://idealica-italiauficiale.website/format_of_two_column_cash_book0rni4.pdfIn PDF document text
    • https://vevofuxideg.weebly.com/uploads/1/3/1/4/131405958/475229b.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/5321316.pdfIn PDF document text
    • https://gomibabojusul.weebly.com/uploads/1/3/1/4/131483197/wuleven-polabav-vefolekenamidu.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/gepijivoperubedat.pdfIn PDF document text
    • http://titanovyi-filtr.ru/666277763083nqoc.pdfIn PDF document text
    • http://wugumonisukanib.sportsontheweb.net/rugetakibojezedibakilel.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/93960114742.pdfIn PDF document text
    • http://xebupado.mypressonline.com/zagepixonubunizupomurival.pdfIn PDF document text
    • http://votilabelomebom.iblogger.org/singer_futura_quartet_installation_software.pdfIn PDF document text
    • http://ontrade.top/tipajazapodota7z7tj.pdfIn PDF document text
    • http://vengriya.space/cell_structure_and_function_class_8_mcqmedf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jikopot/xinapilotawirakan.pdfIn PDF document text
    • http://letufikafiv.epizy.com/jupopixegofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89e40b7-e30e-461b-b9b2-a9576fad56a8/shark_navigator_upright_vacuum_cu500_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c0f35e-7e82-431e-aa08-0257a7110b96/how_to_figure_out_end_behavior_of_a_rational_function.pdfIn PDF document text
    • http://zoxutudirufusoj.epizy.com/72699181715.pdfIn PDF document text
    • http://kifobidurusidi.epizy.com/87417158358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf75b13-d61f-4861-8673-23ba4ccbc0fa/what_kind_of_engine_does_a_toyota_corolla_have.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/aqua_data_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/rujozivakotegatevaropewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4596ba10-e90a-460e-8c53-4698cc14729e/how_to_blender_animation.pdfIn PDF document text
    • http://jewofeket.onlinewebshop.net/pevenavepafolojefu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 5500 bytes
SHA-256: 7d638b75c48de02add31778791f8b3affd6526dbaeb3f5f3885ee5c911ee9d6d
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 11892 bytes
SHA-256: 9cb1646a7440b0b4e07e9a987c1fab06d6eecd31029ca695e8f7b9046c45a340
font_02_sfnt_off000128df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e