Malicious PDF — malware analysis report

Static analysis result for SHA-256 19425d98aee491b7…

MALICIOUS

PDF

74.8 KB Created: 2021-03-31 05:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3cfb99133e46c5708605de7ea6ed8d8f SHA-1: a66c33cf30da516c3a84fb2e049aed13423eef0f SHA-256: 19425d98aee491b7485516b341d5539ac20eb57e2e73a46a08d4cbbb15828f6b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/award?keyword=baldomero+romero+ressendi+pdf PDF link annotation
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/leguzazagaze-mesepupi.pdfIn PDF document text
    • https://badupulok.weebly.com/uploads/1/3/4/8/134855905/3bef193c.pdfIn PDF document text
    • https://cdn.sqhk.co/lerutefo/WFS5jgH/57322395678.pdfIn PDF document text
    • https://sokexeziboril.weebly.com/uploads/1/3/4/9/134902232/6b246257.pdfIn PDF document text
    • https://cdn.sqhk.co/zewawugawa/dv2wPiX/49498176441.pdfIn PDF document text
    • https://zadukali.weebly.com/uploads/1/3/5/3/135340438/fidakigalutov.pdfIn PDF document text
    • http://azakalaza5.xyz/butterball_xxl_turkey_fryer_reviews8cqhr.pdfIn PDF document text
    • http://sarkife.site/free_animal_worksheets_second_gradebzexd.pdfIn PDF document text
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/nabuzupebitilabezez.pdfIn PDF document text
    • http://meetsucre.pro/what_percentage_of_the_us_population_has_type_2_diabetes5g9zh.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/how_to_program_cuisinart_ss-15lph70.pdfIn PDF document text
    • http://copyrighytsupport.com/84632966015dkd6u.pdfIn PDF document text
    • https://gigazubexu.weebly.com/uploads/1/3/4/6/134613152/maturuxirapevanemi.pdfIn PDF document text
    • http://tikovg.xyz/54761936174eqfas.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/bibigeY/59248643294.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/samopakamefap/99199683586.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/sanuxigusisadukorufonire.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/37390320767.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/dexekotovalupuz.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/what_is_pennywise_true_form_reddit.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_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 5236 bytes
SHA-256: a173fdbfe69ecb83c326be1ef1a0f1dc2a1ebee807c871ea7ef6cedf7c63cabc
font_01_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 11980 bytes
SHA-256: b47e59e2cb48ec1b1e0e3cace29d80f54048c86bf7b94fda7ddea7ed202de7d7

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