Malicious PDF — malware analysis report

Static analysis result for SHA-256 2239d4daf943375c…

MALICIOUS

PDF

81.1 KB Created: 2021-03-13 14:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d7ba3fde14800868e10ddd0c101019c5 SHA-1: b6671aa3fefe9053d44590f92e444b53344d2250 SHA-256: 2239d4daf943375c572054448f53752e3ae9bff3a6a9291bbbbd108a07fd268a
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to generate traffic or distribute malware. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, appears to be a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dugedepap.ru/award?keyword=aprendizajes+clave+pdf+primaria+6to+grado PDF link annotation
    • https://lirurofimel.weebly.com/uploads/1/3/6/0/136088330/8614894.pdfIn PDF document text
    • https://xajavixakopus.weebly.com/uploads/1/3/4/8/134898113/9399611.pdfIn PDF document text
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/9b373de2dea7a.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/8a5900e83e.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/d485b72b7a72c46.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/erikson_8_stages_of_psychosocial_development_chart.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/zituruvudupowi.pdfIn PDF document text
    • https://mikatafa.weebly.com/uploads/1/3/1/3/131398449/215d6f4e93c1e7d.pdfIn PDF document text
    • http://albl.ru/bengali_old_is_gold_song4e7bx.pdfIn PDF document text
    • http://reduslim-siteofficial.site/united_colors_benetton_baby_online_shop_usarnxh5.pdfIn PDF document text
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/d51ffe50.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/5cfc33a16b6fef0.pdfIn PDF document text
    • http://fortysgjdk.fun/4867769532dti9u.pdfIn PDF document text
    • https://luletifolavok.weebly.com/uploads/1/3/4/3/134369244/zevudowawedu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/6012724579.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/employee_engagement_report.pdfIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_ddd8b71e419f404d8543b39348470af7.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_ce222a97a81348f1b5b3c33ddc855a77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/is_a_1500_watt_heater_good.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_2074f7a3317c42698ff5561d9bdadbf3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benuka/intentionally_defective_grantor_trust_tax_reporting.pdfIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_f91d0048b4ea4c42b5c00fa339318036.pdf?index=trueIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_48be5824c38449dfa59b336d339b8206.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 5804 bytes
SHA-256: f0d4dd1139a5311e88476b04c19502de5a7d058c638e498b57fd32a7919de528
font_02_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 2268 bytes
SHA-256: 7f38c7bd3076d5ec567b373f8788658f617417f44aeaffad1c2d563936ecbb0a
font_03_sfnt_off00010ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED5 11588 bytes
SHA-256: 9f4fb25ef9a4a0a1ecc68f88508dd696bf9348ad1ec42119152611777c020038

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