Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81079c8f6698160…

MALICIOUS

PDF

77.8 KB Created: 2021-03-05 16:55:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 632c4096ac835f9668650074f8185c39 SHA-1: 7a16c75ede9b50afb01389033ef660a54cc1b24b SHA-256: a81079c8f6698160159e17056a4c2a365917cddcb2057b07f242ed586f04d666
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=maxi+cosi+pria+85+installation+instructions PDF link annotation
    • http://xexuxobofagidad.22web.org/beats_solo_2_wireless_headphones_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452624/normal_5fe982e694b0e.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/xijuxukejor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_6020225614010.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/canon_t4i_price.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/how_to_turn_off_air_suspension_on_jeep_grand_cherokee.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/virumodukojojeveve.pdfIn PDF document text
    • http://buvavarosavadar.iblogger.org/sugujunanuluxagidot.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/xomepixo/sas_infile_excel_spreadsheet.pdfIn PDF document text
    • http://resexam.epizy.com/olr_ccli_reporting.pdfIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_40d0087673c54754be8efec8076f7ec8.pdf?index=trueIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/why_does_my_bass_guitar_sound_bad.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/34111138654.pdfIn PDF document text
    • http://winivufada.epizy.com/vietnam_life_insurance_market_report.pdfIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_6516a140829c4d03b5659c57b2a44d53.pdf?index=trueIn PDF document text
    • http://keladosa.epizy.com/chopra_guided_meditations_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/silibukezubura.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/67148966130.pdfIn PDF document text
    • http://mofibukuzoke.rf.gd/manualidades_para_navidad_con_madera_reciclada.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/10097635385.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_25056f32256a4ca8a059ea9031da18f1.pdf?index=trueIn 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_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 5316 bytes
SHA-256: a5fab69376b2cd94e8a6dbf5d3cc499092cfb12cc33472926680ab4b8651153a
font_01_sfnt_off000105a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A9 10444 bytes
SHA-256: b4bf7e77cd88777090efaf5976cf52b6d2ede3797cf26736069824179302e534

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