Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa9be881b74476f…

MALICIOUS

PDF

81.7 KB Created: 2021-03-03 06:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 49c5ed214cf88b412a16dd91a8cacd54 SHA-1: 997b178d738ede9726992a1ad9615c50eb3bad25 SHA-256: 5fa9be881b74476fdb4ef8299e3262f32008a1e14484e5a837cd12650ef1eced
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically highlighted as a 'link farm on disposable hosting' and associated with a phishing lure regarding salary. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content, 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 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://ponafet.ru/strik?utm_term=is+6000+usd+a+good+salary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447631/normal_602bdc2dc088c.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/41160647196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462073/normal_600a3ef14cf89.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/2016_buick_lacrosse_owners_manual.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/52023849847tu8et.pdfIn PDF document text
    • http://imkl-checker.com/bluestacks_windows_8._1_proqgwtm.pdfIn PDF document text
    • http://hookup666.site/foolish_beat_sheet_musicqekxp.pdfIn PDF document text
    • http://world-wildshop.com/77463010494n9mmz.pdfIn PDF document text
    • http://detonic-de.website/xipovesujixukuka25jon.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/veselep.pdfIn PDF document text
    • http://steblin.pro/factorio_oil_ratiosb3bir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458150/normal_5fdf387db9215.pdfIn PDF document text
    • http://ridunculus.com/93072868858zwbce.pdfIn PDF document text
    • http://ru-1.casa/murder_on_the_orient_express_movie_reviewsv4iux.pdfIn PDF document text
    • http://rte-ita.fun/student_questions_for_fireworks_worksheet_2_answersuouuy.pdfIn PDF document text
    • http://discout.online/6262972135gxcoi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bamonoxo.onlinewebshop.net/should_school_subjects_be_capitalised.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/sunbeam_heated_blanket_microplush_10_heat_settings_queen.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_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 5328 bytes
SHA-256: bc468a818d5463172da30f60c5976c99ea53f39db03498a50d5eaeb1cfcac806
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 10764 bytes
SHA-256: 2ea870c73c7318aae638d5ae1b54b54981097a534a9c2c159c83b3a2a9ffd0c4
font_02_sfnt_off0001240b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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