Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdeb543d3ad719c…

MALICIOUS

PDF

149.7 KB Created: 2021-03-16 07:36:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b9ab5fee3aa48522e2512ff0a9af5e38 SHA-1: 931f24dbe48bf590a9883cfbd03444c7ef278fb1 SHA-256: 1cdeb543d3ad719c2f599c1b87ebb3cc07760b8b25fdf11345ff63c9eeda8a29
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one specifically identified as an external URI pointing to 'soxebez.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is structured as a link farm on disposable hosting, suggesting a phishing or redirection attempt. The presence of embedded URLs and the link farm structure strongly suggest the document's purpose is to direct users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=google+digital+skills+for+africa+answers PDF link annotation
    • https://cdn.sqhk.co/moturira/hgTjTfy/18886171593.pdfIn PDF document text
    • https://nasiposeki.weebly.com/uploads/1/3/4/7/134709897/4c9b40302.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/gdhh0hh/75685511042.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/Tgg6ifg/download_game_rock_of_destruction_mod_apk.pdfIn PDF document text
    • http://mavpa.fun/juwubememizusat0b71.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/cTifgz2/36008565594.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/V7oHDN7/dipafutozudeb.pdfIn PDF document text
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/pajuruzidowet.pdfIn PDF document text
    • http://business-open.online/telotitizefogaxuturub11hx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_c354f59fd0c24ca3bd77863c890592ee.pdf?index=trueIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_b1e9b0b49dc54720ad2285f0496bbfdd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lewuli/extenuating_circumstances_form_university_of_bristol.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_99a3dd5370574f63a5283a6dc2d2c7a1.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_3d2c8fcd686843989e45557201d31a57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/junogizi.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_3b4f22623c754173bd7c699616bfe4c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/vivaldi_concerto_for_2_violins_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/lullaby_for_a_princess_cello_sheet_music.pdfIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_525e5376ef3249c5a64386aac14685b2.pdf?index=trueIn PDF document text
    • https://c8f0d892-4c73-447a-841b-b6a48a565a7d.filesusr.com/ugd/928a57_fa1c16c82db04d82899a3f15944c0e7c.pdf?index=trueIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_0d89e64c78b647ae9ea6188e24f1e36e.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_off00020d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D8A 5376 bytes
SHA-256: d9b5155b591e7f96cb896f66a24504010790d6bc1877cf752f870ecda4bf6666
font_01_sfnt_off00021ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21FFC 12196 bytes
SHA-256: 73f6d821f83fc43e7a0d046b154446237c1114b338167b9eaf5789d7a0e23ede

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