Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dacd94559faefd…

MALICIOUS

PDF

77.6 KB Created: 2021-02-15 04:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b759a78ad6b6bacd22d490c3dca49c9b SHA-1: 84ebb282bb72d3f7d38cfce164045616c3c8b10e SHA-256: 41dacd94559faefd683731f852bb909242c99ed7e2c25b4c6bf76f51fb8360e9
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a likely attempt to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to host malicious content or redirect users.

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 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://leonvi.ru/wix?keyword=sports+head+soccer+barber+games PDF link annotation
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/ee1f77012615.pdfIn PDF document text
    • http://crysety.xyz/63476225052erz2j.pdfIn PDF document text
    • https://dowizipolejufu.weebly.com/uploads/1/3/0/7/130775784/mogimogoxotijawugu.pdfIn PDF document text
    • http://todayit.pro/transformice_shaman_skill_tree_guideyqzjf.pdfIn PDF document text
    • http://poroda.site/annual_credit_report_government_sponsored79e2f.pdfIn PDF document text
    • http://it50disconto.info/executive_summary_report_template_freeuhm91.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
    • http://dapobepopid.rf.gd/lodoxisimalirobuv.pdfIn PDF document text
    • http://kafopazam.epizy.com/77326582361.pdfIn PDF document text
    • http://mutifesojare.epizy.com/questions_on_periodicity.pdfIn PDF document text
    • http://livibodake.rf.gd/kozujojabof.pdfIn PDF document text
    • http://buwobazakosujo.rf.gd/roruvizigafekididotalu.pdfIn PDF document text
    • http://fedasumenusum.rf.gd/67589966355.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/adding_and_subtracting_fractions_worksheets_7th_grade.pdfIn PDF document text
    • http://mulunatebena.epizy.com/kobanaginimo.pdfIn PDF document text
    • http://nifubaj.rf.gd/wawefe.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_off0000e5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A4 5332 bytes
SHA-256: 9f402aa0e99a467ff3019431d9f01d60bc7335162656250d7d66b102fb980fe1
font_01_sfnt_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 10324 bytes
SHA-256: d5873aa2f697851e72a7555a427b2443fa0f9fb70b36b34b8efda409b4e2bd5c
font_02_sfnt_off00011aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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