Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a37be7e3e9fdd0…

MALICIOUS

PDF

75.5 KB Created: 2021-05-11 00:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6f6f1ae46125281063457f37242f266b SHA-1: 94c02c1d053a16ff1eac5917aaee2257f19cfa2e SHA-256: 34a37be7e3e9fdd05c9acf7661d250eaee0ab616b0bfc9d1fa13f14b1215c67a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://vilenefex.ru/strik?utm_term=insignia+converter+box+ns-dxa1-apt PDF link annotation
    • http://vwwv-avito.online/57033609249199i2.pdfIn PDF document text
    • http://gekiwejal.scienceontheweb.net/adjective_list_with_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/xomatujod/igIhbjc/munidomojefosol.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/AyiihhZ/vudonorolegovakuno.pdfIn PDF document text
    • https://cdn.sqhk.co/danajuva/rrhhTic/repairing_holes_in_plaster_walls_with_drywall.pdfIn PDF document text
    • http://sutobep.getenjoyment.net/70580913214.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/buwoxob.pdfIn PDF document text
    • http://tonojodozif.mypressonline.com/viwaripidisuxidixesob.pdfIn PDF document text
    • https://lufegema.weebly.com/uploads/1/3/4/1/134132410/7994970.pdfIn PDF document text
    • http://grenkasalo4.xyz/26178198578lg1t0.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/nibXiaN/qksms_failed_to_send.pdfIn PDF document text
    • http://my-favshopf.online/dark_tower_series_in_reading_orderz15yk.pdfIn PDF document text
    • https://jipedopifuxo.weebly.com/uploads/1/3/4/0/134042804/divel.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/amendments_worksheet_answers.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/perspectiva_caballera_ejercicios.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/nonop_duvifibidawem_gekofubowi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapekafuxururo.myartsonline.com/26371549136.pdfIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_3de1a71cf2384d5589af7417143ef9b0.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_df9d1787ee50405691cb3048b7da0557.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_d20bd0adfc3c4af7b1c9266c155d938d.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_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 5500 bytes
SHA-256: 94e57e9fc6e271e9307add1561e167473884fa07451639afed867898c03fc31e
font_01_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 10876 bytes
SHA-256: 49deaa563ee9aa8dc931992b205d4a54c93cdf78c191e9c3dabd41e2e47b0d40

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