Malicious PDF — malware analysis report

Static analysis result for SHA-256 628cb4d35733c611…

MALICIOUS

PDF

100.6 KB Created: 2021-03-10 00:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 55ebd72b6650e68500c2e54afd5cc567 SHA-1: 796854dcaf40605d6ad3bf733dd4f9b686469e9e SHA-256: 628cb4d35733c61121a4bb3606f33f6ed84b10232cb9ea26b846da4befeb924c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body and embedded URLs suggest a lure related to downloading books, which is a common tactic for distributing malware. The presence of multiple disposable domains and link farms further supports a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://botokaw.ru/award?keyword=ethiopian+history+books+in+amharic+pdf+free+download PDF link annotation
    • http://taxevidel.medianewsonline.com/xuzoma.pdfIn PDF document text
    • http://milafikolume.iblogger.org/39140825554.pdfIn PDF document text
    • http://vosojivaru.mypressonline.com/93479053206.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/59723893652.pdfIn PDF document text
    • http://libertinemodels.com/78648788862xd7c3.pdfIn PDF document text
    • http://stat-index-co.com/how_to_check_your_ring_size_chartk4xia.pdfIn PDF document text
    • http://urro-hu.com/delete_watermark_online_freeulw7g.pdfIn PDF document text
    • http://liwitesuzemumex.sportsontheweb.net/dixodutonenojexeke.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/zofutoxalefunodikafumisif.pdfIn PDF document text
    • http://biomanix.best/ben_10_alien_force_game_download_for_pcpv8b2.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/michigan_child_support_address_change.pdfIn PDF document text
    • http://dutalamujuso.66ghz.com/autocad_2014_keygen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d27c610-8e74-43e5-abc3-bf600efc275c/the_white_tiger_movie_download_moviesflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/747e3eb1-1fbb-4120-8aeb-c45d01caf9ff/legofufasawunogokamivi.pdfIn PDF document text
    • http://mosupixozijet.epizy.com/differentiated_learning_strategies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8804a2c0-ddd8-4b3d-b2d3-c422c8579c61/air_force_reserve_officer_monthly_pay.pdfIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_1fed0161341e4e7c9e980363e481576c.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_993bd89cbe24471fa4741b5bd9364320.pdf?index=trueIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_95bf1156d9224663a57322663526fc68.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_65f23b2c3cb947f5bc5cfe39a42012be.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4601737-e190-4056-8672-912aba7b6154/16264961405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df5df6c-d1f1-4482-a368-3aed133a5d0b/roziritekosedorixis.pdfIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_7db9b7a42f904142af496f80be32fba4.pdf?index=trueIn PDF document text
    • http://zevesijuduma.atwebpages.com/gypsy_moth_caterpillar_rash.pdfIn PDF document text
    • http://jumerajoge.epizy.com/51907498432.pdfIn PDF document text
    • http://resegubus.rf.gd/wayne_dalton_torquemaster_spring_replacement.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
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 32552 bytes
SHA-256: 4b371809e63092dab1c75db4fa5ee8213d3bb65be12597c3ab45a4b708692c8f
font_01_sfnt_off00014c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C96 5752 bytes
SHA-256: 54d700eb94d33c23f4a361c2214046f8c5a2dadb716f7f9a2520c47fed745f22
font_02_sfnt_off00016017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16017 10504 bytes
SHA-256: ef068c69c89a28a1ccbdccabac1ecda52366d8ac189ff82aa48afe90fd84cd41

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