Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb84a4fa307f1224…

MALICIOUS

PDF

70.6 KB Created: 2021-04-04 17:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b693d678329a9bf45193b4be0e1fc9a4 SHA-1: 22a5811ce34f1c4abe163d5c3c9e6009dd0b2f3a SHA-256: bb84a4fa307f1224fcbd43eff2c2ca49ab581622c8293781126a7967735a4da0
126 Risk Score

Malware Insights

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

The PDF contains multiple external links, including one to 'golowaki.ru' with a keyword suggesting a document about anxiety in adolescents, and another to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's 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://golowaki.ru/award?keyword=consecuencias+de+la+ansiedad+en+adolescentes+pdf PDF link annotation
    • https://fawewunukeni.weebly.com/uploads/1/3/0/7/130739651/9663904.pdfIn PDF document text
    • https://piligerababuge.weebly.com/uploads/1/3/5/3/135324290/3e122b9c7aab14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_60318cf6a6379.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490722/normal_600388a8ca50b.pdfIn PDF document text
    • https://pokeboxut.weebly.com/uploads/1/3/1/4/131437348/murobawuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456116/normal_6013057f3a032.pdfIn PDF document text
    • http://pss77.ru/john_deere_950_tractor_specs7503o.pdfIn PDF document text
    • https://jiludagurifo.weebly.com/uploads/1/3/4/3/134349737/3024417.pdfIn PDF document text
    • http://zuvixomajav.22web.org/binomial_expansion_test.pdfIn PDF document text
    • http://zatoboyvibor.fun/youversion_bible_app_offline_apkgulkh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406501/normal_6053125891a6f.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
    • https://uploads.strikinglycdn.com/files/6fde4869-1706-4d3e-80c9-ee84d0586442/jajijudogudixijolebakejuv.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/blog_page_design_template_wordpress.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/basejigidagevekufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd131133-254c-48ff-b742-ef2882ae1535/excel_urgent_care_cypress_covid_testing.pdfIn PDF document text
    • http://megavidovafivo.epizy.com/botulinum_toxin_in_aesthetic_medicine_mauricio_de_maio.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/dyson_dc25_animal_spare_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/94766926950.pdfIn PDF document text
    • http://nenidexixod.epizy.com/crystal_report_visual_studio_2013.pdfIn PDF document text
    • http://gonatiw.rf.gd/shortcut_key_moving_between_excel_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/organize_now_a_week_by_week_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b34a841-3320-4a5b-9b20-5d938b0588bb/dabixaxot.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_off0000c8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DA 4960 bytes
SHA-256: e8fbcce08b08b1883626d853d61cfb1a55aadaff0957b8b0477ae413a7c19d9a
font_01_sfnt_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 10644 bytes
SHA-256: c09f722f9b64f32f539e620a7079db1c226848d239b8f2e399c645e9f5225e84
font_02_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71