Malicious PDF — malware analysis report

Static analysis result for SHA-256 7825aa332fdf7175…

MALICIOUS

PDF

77.0 KB Created: 2021-03-24 04:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ee220728a55b25bdf0560e0d011b48d7 SHA-1: 2dee3c2ca2a50e7f268330e481c28c197fde423e SHA-256: 7825aa332fdf7175fe2f6a533976dd08027999b1fa1b38f08d7587db8adf8b34
134 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. It uses an invoice-themed lure. 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 0.9993

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://resalured.ru/strik?utm_term=iso+9001+2015+audit+checklist+excel+.xls+template PDF link annotation
    • http://zawukinaloluku.sportsontheweb.net/biology_class_12_ncert_solutions.pdfIn PDF document text
    • http://tonilakifak.mypressonline.com/gazasufofo.pdfIn PDF document text
    • http://ropisunofo.mygamesonline.org/letter_of_recommendation_for_scholarship_from_principal.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/what_is_the_best_case_for_galaxy_s9_plus.pdfIn PDF document text
    • http://werojati.getenjoyment.net/92591033997.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoroxur/borXngc/tokejoroko.pdfIn PDF document text
    • https://cdn.sqhk.co/gasupewu/MTBdijf/vivorewosepurofonovamo.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/the_shack_william_p_young.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/29807387891.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/ibjbjgY/willie_nelson_songs_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tekuligote/9ENQieo/furry_fandom_documentary.pdfIn PDF document text
    • http://mofonuf.medianewsonline.com/scrum_master_certification_questions_and_answers.pdfIn PDF document text
    • http://retamos.mygamesonline.org/the_past_in_perspective_an_introduction_to_human_prehistory_8th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuvuvemalazot.epizy.com/swat_callouts_lspdfr.pdfIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/what_is_starcraft_vinyl.pdfIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_02ce730c252a4d9da12d7605fa62700d.pdf?index=trueIn PDF document text
    • http://nobapizasiwe.myartsonline.com/31703162745.pdfIn PDF document text
    • https://ad060920-74d0-4a59-a46a-f478898ed72a.filesusr.com/ugd/a7c1e6_e95c4eb71e4f42e3adf73724b82b73a4.pdf?index=trueIn PDF document text
    • http://xefobimulekojuw.epizy.com/steinway_buyers_guide.pdfIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_e167e543d83b4d118646c3a8637b1fb8.pdf?index=trueIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_24b2933eed5d4cb1a2cb6be7c4086c93.pdf?index=trueIn PDF document text
    • http://gaderadosunuse.rf.gd/maus_2_summary_sparknotes.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/burckhardt_the_civilization_of_the_renaissance_in_italy.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 5924 bytes
SHA-256: c0cb766665d653bb5f017893375a0926a996cad7a462046117cfb36b8f393c30
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 11032 bytes
SHA-256: a89545a0dac5f540ea8038cca49eb0df33be99f76b6461f2c4457f44a3a93b41

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