Malicious PDF — malware analysis report

Static analysis result for SHA-256 89dfe3a28346e2e9…

MALICIOUS

PDF

80.0 KB Created: 2021-03-23 08:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ac688da3cd9ef18d0a57d0336bd5b665 SHA-1: c20a2545793c8d17ccbdc3a97248afb437a9addb SHA-256: 89dfe3a28346e2e9ffe50a4d82d46fbbaad0903e8a91c9a18e9aeb246aa7b1c7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a high ML classifier score indicating malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution attack pattern. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to malicious sites.

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://gimoguvi.ru/123?utm_term=leave+of+absence+letter+format+for+school PDF link annotation
    • https://cdn.sqhk.co/mibuguxinise/3gGhfih/allegiant_stadium_inside_view.pdfIn PDF document text
    • http://wewofif.scienceontheweb.net/kenmore_dryer_code_f70.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/binozu.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/zpyhcgh/siredokakepitabumenajoge.pdfIn PDF document text
    • http://gazorowegesejix.22web.org/how_to_get_apprentice_riding_wow.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/85362245205.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/5th_grade_geometry_worksheets_free_printable.pdfIn PDF document text
    • http://rijunoje.mygamesonline.org/99575973551.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/34648650829.pdfIn PDF document text
    • http://fedexonep.mypressonline.com/bugezisazefudofewukak.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/83902907718.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/pobuzakivararetid.pdfIn PDF document text
    • http://mibejar.sportsontheweb.net/abstract_sample_for_thesis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zesafemumibow.myartsonline.com/data_mining_tools_free.pdfIn PDF document text
    • http://lamafuravufezin.epizy.com/99187901796.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/homophone_worksheets_for_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/tapowulutoreritibovig.pdfIn PDF document text
    • http://zadakirilavaru.rf.gd/how_much_do_freelance_developers_make.pdfIn PDF document text
    • http://vutesupazidoz.epizy.com/aptitude_questions_and_answers_tcs.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/adverse_opinion_audit_report_in_pakistan.pdfIn PDF document text
    • http://fazatela.myartsonline.com/agriculture_biologique.pdfIn PDF document text
    • http://zemoriwakaxi.epizy.com/microsoft_excel_2020_tutorial_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 5000 bytes
SHA-256: efe529c884552e5a16c3a57fafea9123a2eb912dcea78371b965c03c5d833492
font_01_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 10836 bytes
SHA-256: a172bd13900fb9d43aa25bc528efc2fc90f166eb90a02e628da7f4032f9b0bfb
font_02_sfnt_off000123fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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