Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ae027f614c236d…

MALICIOUS

PDF

78.4 KB Created: 2021-03-15 18:12:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a637f224679f5182e00defd687cd423d SHA-1: 17a896b1a3441ac7bc9da1d87ed21948d501ab2e SHA-256: 96ae027f614c236df75d6bd7bf253248a4f90483276657d7e747f8921b8c51eb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or distributing malicious content. One prominent URL, 'https://nipisod.ru/strik?utm_term=flowchart+maker+software+for+windows+10', suggests a lure related to software downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://nipisod.ru/strik?utm_term=flowchart+maker+software+for+windows+10 PDF link annotation
    • http://bojexatonumeme.iblogger.org/67953576656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456420/normal_603ffdfc50da1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470699/normal_6047d0b89f0c1.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/xefezesebusu/poxadajaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea38511a-8cd1-4028-a5cf-170a1a6c0ae8/graco_duet_sway_swing_with_portable_rocker_weight_limit.pdfIn PDF document text
    • http://loletusu.rf.gd/lumigopun.pdfIn PDF document text
    • http://rixoxufutafugi.rf.gd/best_inspirational_books_to_read_2020.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_3e781640aaca45dcb7167ce8f97304dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57fab5d7-8b66-4a2a-b56f-03900d085e94/sipidas.pdfIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_67fb6afc71b44760ae098a3fbf64ecb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/finance_ratios_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38e47b6d-c4e9-4b01-aaec-3763cdedb54f/jovulokobo.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/muwajekux.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_fc49aa0b21f748a6a7a10441eafcb439.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lukepepe/magovurorobasunulakoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07031af-bf66-4003-9dc8-bbf3eba24a68/schlage_keypad_locks_not_working.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_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 5564 bytes
SHA-256: 794503a80fe7052340a5a30d86de7120f9962ecb91899caee1fd62c74f60cc14
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 11212 bytes
SHA-256: 23967ac4ea510971cf9ac8bbc568b3c0b4cb25a58b5c48c6d5acedb97af75ca5

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