Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7090c0f43da0b83…

MALICIOUS

PDF

78.5 KB Created: 2021-04-19 08:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 084522b7da3f9744042cb75cfa24be83 SHA-1: 267542220421029d88e36b9402b7cf8c96b25925 SHA-256: b7090c0f43da0b83bbf81bfbd1532742755fe8882705c90c3234f38491d2b461
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URIs, with a primary suspicious URL pointing to 'bologen.ru'. The PDF structure and embedded content suggest it's intended to redirect users to a collection of other documents, likely as part of a phishing or malware distribution scheme.

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=the+pyramid+principle+minto PDF link annotation
    • https://cdn.sqhk.co/xemugugafot/ia8Xmhf/minecraft_story_mode_2_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/AbTijha/temuxifulovevikumu.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/how_to_light_rheem_tankless_water_heater.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/85230144381.pdfIn PDF document text
    • http://cz-nitrof.website/data_structures_and_algorithms_in_java_4th_edition_solution_manualizgs5.pdfIn PDF document text
    • http://gazupoz.sportsontheweb.net/18274598064.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/92213029459.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/jbAidig/wodejozades.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/98385596655.pdfIn PDF document text
    • http://jatudoz.getenjoyment.net/automate_boring_stuff_with_python_download.pdfIn PDF document text
    • https://cdn.sqhk.co/musarawaw/TUQHjjp/trailer_propane_regulator.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/language_in_sociolinguistics.pdfIn PDF document text
    • http://medicalpracticementor.com/gmail_email_template_htmlhgbeo.pdfIn PDF document text
    • http://spencermcman.us/superhero_run_2019_california7a18b.pdfIn PDF document text
    • http://fisitupogavi.mypressonline.com/java_apache_poi_generate.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/M3fGhjA/balance_ball_chair_australia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/how_to_describe_a_forest_creative_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/xisojolafamebitef.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/sugujatorimesakeleraw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc92b209-14f3-4726-ae79-fc5a50b729d0/89147594168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f8ee717-e36b-4772-8cf1-43e04c6d7fbf/63410641142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/549aad8a-8287-4865-88c9-424a1793d895/gosunufodimabinovidotorej.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_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 5184 bytes
SHA-256: 3a9d07fef69a81da37da9f11a54f6d97a811d014103719302a09831f9d56ea17
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 10900 bytes
SHA-256: 75b2e2e29f4f96e8027eb2207bbc952acc09be92a6aec6a00f9e877e0125effc

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