Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33942b1f4bfb3db…

MALICIOUS

PDF

87.5 KB Created: 2021-04-03 21:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 802375359092ee3f807d779812377ebe SHA-1: c1b61ede204c3fa61f208862c04dda74708ffb6a SHA-256: f33942b1f4bfb3dba1a3ab72de1d64ddafd616ea21627d3c903d8f7bf1b02781
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9996

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/award?keyword=ad+agency+company+profile+pdf PDF link annotation
    • http://moxegelubopidi.sportsontheweb.net/bisizipupapedavukog.pdfIn PDF document text
    • http://foselosen.sportsontheweb.net/fevikenamogawunomu.pdfIn PDF document text
    • http://sigixexizo.sportsontheweb.net/soal_barisan_dan_deret_kelas_11.pdfIn PDF document text
    • https://mezinetoxapim.weebly.com/uploads/1/3/4/8/134887379/3239356.pdfIn PDF document text
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/romovolojexuduf_bupob.pdfIn PDF document text
    • https://juvivufoli.weebly.com/uploads/1/3/5/3/135325295/4711376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_6055572443bcf.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/bazolevuniwapoxew.pdfIn PDF document text
    • https://ramorebuba.weebly.com/uploads/1/3/4/8/134898890/b71470.pdfIn PDF document text
    • http://zasazigupat.getenjoyment.net/julikenovisuzeno.pdfIn PDF document text
    • http://tinesemexogo.mygamesonline.org/33289648445.pdfIn PDF document text
    • https://kawuzuke.weebly.com/uploads/1/3/1/6/131606938/muzupudeda_jexuwodiv_mikifikif.pdfIn PDF document text
    • https://wuxuvekukiku.weebly.com/uploads/1/3/1/3/131380251/jatiw_fadoberes_wepukizenifinu_volulisupugem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_6041f5dc498fc.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/libros_basados_en_hechos_reales_gratis.pdfIn PDF document text
    • http://pisumuvate.sportsontheweb.net/xodidedis.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://sogivuwe.onlinewebshop.net/xubabeb.pdfIn PDF document text
    • http://ruzakema.onlinewebshop.net/berger_paints_annual_report_2020_19.pdfIn PDF document text
    • http://xobibaga.myartsonline.com/nimisenukaju.pdfIn PDF document text
    • http://zilowovuv.atwebpages.com/mikironukan.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 5096 bytes
SHA-256: 6bf80206702de5ca69122d1a58361007f96ae8c1aaefb2f6429f2ae1e26d126d
font_01_sfnt_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 10776 bytes
SHA-256: 3daad3faee5c90d60910b8f5c02093020b09762b0adc7ffffa1470ad22740af5
font_02_sfnt_off00012d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D68 16128 bytes
SHA-256: 9876d0897ec9c8daf800546b62de215c972fdd6e45e85ac3a8ec620a70dbc6f8
font_03_sfnt_off00014248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14248 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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