Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97090b34442cfda…

MALICIOUS

PDF

84.3 KB Created: 2021-03-17 20:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a8cc0226193ae2d8e121a4634da41cb9 SHA-1: 13e865ec35caebed471f318d4587e7f5a88cd179 SHA-256: e97090b34442cfda28804fcd44047acad2a52842ce5c9bb324395cea3fbe77e7
186 Risk Score

Malware Insights

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

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 6

  • 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 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://nipisod.ru/strik?utm_term=jabra+freeway+manual+dansk PDF link annotation
    • http://siwupojotuj.getenjoyment.net/jeffrey_sachs_books.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/manebija.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/14770241738.pdfIn PDF document text
    • http://kuwawaf.mypressonline.com/artrosis_de_rodilla.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/what_is_big_data_and_analytics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_f31517afc063499cb41f0a7d4eb56355.pdf?index=trueIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_5a277f71f78b4e629f9a88d62d82b562.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_abf3e15b2d1146628c8872c087c8f39b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/planet_fitness_membership_number.pdfIn PDF document text
    • http://gakamaxoluzes.atwebpages.com/9493487600.pdfIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_4a263ffc94c44b8685945213452034f9.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_3b0132ebb42c4d22b60c679e7def6961.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_b88108b428604655bf48ec02fcb99d50.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_766f142aec694eb9bd269b7c6e3b99a2.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_ab6f6b70c7ad4146b2a4e77a52a21a36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/abstract_acrylic_flower_painting_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/mobile_timesheets_app.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/harga_pasaran_avanza_2010_type_g_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/high_school_map_minecraft_pe.pdfIn PDF document text
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_ae957e15bbd943599094336b0d502753.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_91c0dfb59e5d45c488cd42ff2ec25edd.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_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 5440 bytes
SHA-256: e8bfa0f51a91933529e37abe6c7a6fec8d2d076ddfe0e3a447ef29f6d46a4c34
font_01_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 12992 bytes
SHA-256: 96f2f43d33e8d652086d7402e2b0a31976e24846c7e464a3b37db7802beb8f24

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