Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf2a31424352a94…

MALICIOUS

PDF

79.0 KB Created: 2021-03-19 02:27:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ea626de518edae346bff11abffafbbe2 SHA-1: 101d90133bd17d724697d886dc79fc3a16ee024e SHA-256: faf2a31424352a94b0b179df43ee3b344e799505c3a6ef66fb240dd9ba73825a
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, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a common tactic to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/award?keyword=chemistry+review+packet+answers+pdf PDF link annotation
    • http://xsafak.com/crimson_tidestallion_guide9qfzc.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/X9vMjeR/61666621688.pdfIn PDF document text
    • http://ihsteam.ru/pixelmon_evs_ivs_mod_1._12_2mpht4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_6043461bd1a99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_604d3505142ad.pdfIn PDF document text
    • http://martans.space/investigacion_cualitativa_sampierizt9af.pdfIn PDF document text
    • http://meetly.space/the_beatles_anthology_dvde4ag4.pdfIn PDF document text
    • http://tcerkovniekupola.space/how_to_make_work_plan_in_excelg1ivf.pdfIn PDF document text
    • http://beststudent.space/announcement_departure_employee_templatesicsb.pdfIn PDF document text
    • http://lesantyqas.online/the_wind_in_the_willows_musical_lyrics8jk5c.pdfIn PDF document text
    • http://health-top.ru/82115212022hkxs4.pdfIn PDF document text
    • http://molotkov.site/97292841365972zl.pdfIn PDF document text
    • http://uscarinsurance.info/26355438290xt708.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/gjbibjh/megan_fox_husband_net_worth.pdfIn PDF document text
    • http://lynciguest.com/petofatunuwabavi5h7gg.pdfIn PDF document text
    • http://max-lifting.store/50085406689vmwj3.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/geieQWk/google_spreadsheet_api_php.pdfIn PDF document text
    • http://notdull-eng.online/vawasomirazabixurobere6qv5.pdfIn PDF document text
    • http://priz24.site/www.tutuapp.com_para_pczyryp.pdfIn PDF document text
    • http://prodive.su/one_touch_ultra_2_says_control_solution5m6oa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_bf5cc186b3104c03b9abbb48e6096af9.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_b098c0ca1a7b4e698641a3d131807f0e.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_8fd68096eb2e44d5aad5cb687bae4adc.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
    • 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_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 5588 bytes
SHA-256: 67e60988f5d50c0e1e50b4bbd1035072aa18c98140d90a4c3c873772f0a4c7c9
font_02_sfnt_off0001081f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 11100 bytes
SHA-256: 75f191eae67affc42054e1370008b207e93b24648731aad3bd6c3a8cc4bbe27d