Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36c4088977fe8bf…

MALICIOUS

PDF

82.7 KB Created: 2021-04-07 18:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0a2019aae2ed1fefde4d311a9af06e79 SHA-1: 79c0cc7eac89bfc827e1f7e745a02ca48f4f6f09 SHA-256: f36c4088977fe8bff4b7006de9dedbc5df2c35a36d519469eb10b14ba957f376
126 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=how+do+you+check+the+transmission+fluid+on+a+2006+nissan+altima PDF link annotation
    • http://besemafobekilir.22web.org/leviathan_guide_kotor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383572/normal_601ae3e6366db.pdfIn PDF document text
    • http://olymp-trade.top/how_much_fuel_does_an_eberspacher_heater_useh9vmm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492555/normal_605d8a73cdc8d.pdfIn PDF document text
    • http://good-production17.site/brother_toner_tn-630_tn-660xrrea.pdfIn PDF document text
    • http://motofad.iblogger.org/pojusasa.pdfIn PDF document text
    • http://wssummer.space/netbeans_for_mac_high_sierrayqrwm.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/jarewikuwuvuxuvixofmn0xu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_6033097a02df0.pdfIn PDF document text
    • http://future-techno.ru/what_is_the_most_illegal_thing_to_do640va.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukoter.rf.gd/ozymandias_analysis_gcse.pdfIn PDF document text
    • http://devepovamijube.epizy.com/basic_communication_engineering_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb10b8bb-24b7-4aaf-abd2-c357179aef47/45306850093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccff4e27-3786-4a0c-8f59-84629a4c4ad9/shipboard_oil_pollution_emergency_plan.pdfIn PDF document text
    • http://mabagojovas.epizy.com/lisokelolidivefob.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/expense_account_template_excel.pdfIn PDF document text
    • http://lajopimuwaxefi.rf.gd/depuritokevumiruran.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/powerful_background_presentation_music_royalty_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/european_certificate_of_conformity_mercedes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4D 5908 bytes
SHA-256: 8d744b2e8269cf8907ceef18db4df247093508afde35668eb268a7a15cad7f26
font_01_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 10972 bytes
SHA-256: fc6562a5cd44badb50bcf28bf1adeaba55cacd9dabd8ef2c85de2b74e61c5e99
font_02_sfnt_off000127f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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