Malicious PDF — malware analysis report

Static analysis result for SHA-256 665a372e98520c02…

MALICIOUS

PDF

77.2 KB Created: 2021-03-20 16:15:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d73d28138989a6c73d16e237ee63d4fe SHA-1: ee1400ea59db83007320860a8aaacf5e69e819c4 SHA-256: 665a372e98520c02a6c57cd55cce5a1953c63160bc0a1011d0535a3c6a7c700f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to 'ponafet.ru', a domain flagged by heuristics as potentially malicious and part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, contains keywords related to 'Netgear router mode', suggesting a lure for users seeking technical information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=what+is+netgear+router+mode PDF link annotation
    • http://vajukadezazi.getenjoyment.net/ocr_arabic_to_word_online.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/me_after_you_book_series.pdfIn PDF document text
    • http://luxomozuk.mypressonline.com/chemistry_definition_of_standard_enthalpy_change_of_formation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_602504f1c926c.pdfIn PDF document text
    • http://megantv.site/fubuwunen4tdrk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_6042cf4379938.pdfIn PDF document text
    • http://christmas-gift.ru/my_boy_gba_emulator_full_freegno7w.pdfIn PDF document text
    • http://nazhivy.net/40299228678rnoqt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_600d5161848eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_601d2b7a01677.pdfIn PDF document text
    • http://inertbhjbj.ru/deuter_guide_45_backpackrwlib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486041/normal_6005d3c3a75ad.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/ac245cae-649e-455d-ac3f-39e0b8bd7427/how_much_is_a_rinnai_tankless_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84a222f-e635-48aa-bd2f-ea99293dd2a3/nemufakomafivuraxopexav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892d78a6-9bf3-4f0a-aba5-f50c11b0de1e/lixovixitiruru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c631a7-47b2-464f-a4c4-f7eebd8fb906/free_online_ti_34_scientific_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ffdd36-4fd7-4090-a936-0089077ac804/suporixesilizoluf.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/luzoxivezixofite.pdfIn PDF document text
    • http://jemileti.atwebpages.com/70895804429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5845760a-7ae8-4ee2-a3a3-d27e0565ef2d/crock_pot_express_crock_xl_instructions.pdfIn PDF document text
    • http://jewofeket.onlinewebshop.net/minotoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e79e0c-4737-4873-94e3-9cb45afabf92/how_to_crop_picture_in_passport_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14330000-06de-4283-a20b-2b473575996c/kizufubamumi.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_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 5220 bytes
SHA-256: 867abca201c3130e57d918e78616aa2036fb8145c376c17421bb5fb38a717b4b
font_01_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 10788 bytes
SHA-256: ddadc94c7eda20dfd2c2497ff715ed2d3704f0a99a35f4176aba459e8a3872ae

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