Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb28582e054257e3…

MALICIOUS

PDF

83.3 KB Created: 2021-04-21 16:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b53386fdecd2c19a0642f226bb6b5769 SHA-1: 54c0b8292af1ad9b7e7c2c99eef7beb93fc40253 SHA-256: eb28582e054257e361127392b546535f80b3fdaa51983e833227b91b38116400
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 0.9995

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://soxebez.ru/strik?utm_term=gramatica+inglesa+completa+gratis PDF link annotation
    • http://galosidijixiwu.mypressonline.com/41124587298.pdfIn PDF document text
    • http://ig-copyrighthelpcenter.com/82821360995u9bi4.pdfIn PDF document text
    • http://gratoraama.website/bonurugubetatogblx9.pdfIn PDF document text
    • https://xizejaselaz.weebly.com/uploads/1/3/4/3/134357450/fiduzejolizi.pdfIn PDF document text
    • http://kudikadip.getenjoyment.net/zuvividitikowimajopadi.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/fubep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475985/normal_5fce7b3f2f421.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://lepabamun.weebly.com/uploads/1/3/1/6/131636917/bejulazewe_ruzulito_rudiwamal_subigezokelunir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_60358416293a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_6015abb488dd0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixibedi.onlinewebshop.net/7869509695.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_d4f24edf18ad4f4995f372027369b767.pdf?index=trueIn PDF document text
    • http://napamewa.atwebpages.com/87533176029.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/taylormade_r15_tp_3_wood_release_date.pdfIn PDF document text
    • https://78636f1b-f2d6-4e4a-b4e1-07eac4c165d1.filesusr.com/ugd/434c97_f222c129dc004a9493f46420f9a30de9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/430ex_iii-rt_vs_600ex_ii-rt.pdfIn PDF document text
    • http://damowepoko.myartsonline.com/factory_connection_application.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/body_systems_webquest.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/91001920085.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/hoover_windtunnel_3_max_pet_plus.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_d87f0c2e27f6472c8446e7c91081f4fc.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 5284 bytes
SHA-256: f62edbd195da3f78be19688e2053073b7549a2f464c7206aed0ca3f14112a0b0
font_01_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 12760 bytes
SHA-256: 48031d512cbe8ea9cf8996f2c5f8f983b0e0d0f3d7e01342a36bb6df26ac9aca
font_02_sfnt_off00012a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A82 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd