Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d23fec371a149a…

MALICIOUS

PDF

70.1 KB Created: 2021-03-14 23:59:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6976bcde0b5be5b1c5e04f4134adfa5b SHA-1: 2c7c698e502fda1dd93ad57672f7fdb105a214b6 SHA-256: a9d23fec371a149add5fd8eea83fc9293b5abb2af2ae2fb283070ac28f81f2cd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. One prominent URL, 'https://bologen.ru/strik?utm_term=what+god+wants+for+christmas+lyrics', appears to be a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a pattern of hosting numerous links on disposable domains, likely for SEO poisoning or phishing campaigns. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=what+god+wants+for+christmas+lyrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369190/normal_6037428ab898d.pdfIn PDF document text
    • http://nipawifaxupus.mygamesonline.org/makofu.pdfIn PDF document text
    • http://timinome.getenjoyment.net/iso_9001_2020_descargar.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/harry_potter_sixth_year_timetable.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/23402677979.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/duwagulafabijisi.pdfIn PDF document text
    • http://wawimetuboze.iblogger.org/ragufademojuronerar.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/mass_effect_3_prima_official_game_guide_download.pdfIn PDF document text
    • http://tafuvomilo.22web.org/blood-_cerebrospinal_fluid_barrier_formed_by.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/diferencias_entre_caput_succedaneum_y_cefalohematoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496592/normal_5fda5e5b4786a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://logasexa.epizy.com/jeep_grand_cherokee_laredo_2004_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535a02ff-6f6f-4f47-9051-89a48bad46ba/16298989299.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/pc_bus_games.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/panasonic_tc-p42x3x_no_enciende.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d288a7-7870-4115-a1ec-598cee0d3001/pujotutotisikokefesumitu.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/emmet_bootstrap_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/59682161407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f95d87-3774-456a-8b1d-653d548616bf/mapubesabanidexowipap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e3af487-4b06-4c54-9b1b-f8a96970cff0/your_grace_is_enough_chords_d.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/android_intent_bundle_enum.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/1864567387.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_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 5644 bytes
SHA-256: 752a894bbe08edc3b7d73b86df2eb7e58798249e5f019df2c92c03ad0da62947
font_01_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 10372 bytes
SHA-256: c6a20a6ac44c095f0118cffe4a619615df713979a5df120059e18e4c796df453

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