Malicious PDF — malware analysis report

Static analysis result for SHA-256 900bb16fc0f014f6…

MALICIOUS

PDF

90.3 KB Created: 2021-05-14 14:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cf89738f22de3c0f28fd8114d5104d82 SHA-1: 5d071f880627a1e8598321da84ae9de551e22185 SHA-256: 900bb16fc0f014f63d938d0adf80de084af0cad16fe60a40c8ef476f86b9f5fe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=easy+500+word+essay+topics PDF link annotation
    • http://tubujefowabe.medianewsonline.com/adeept_rfid_starter_kit.pdfIn PDF document text
    • http://sotipidikukunow.getenjoyment.net/strength_and_conditioning_workouts.pdfIn PDF document text
    • http://lumogodasekepi.mypressonline.com/belafeveduximovane.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/angina_estable_e_inestable.pdfIn PDF document text
    • http://pegijegur.mygamesonline.org/76282712279.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/alfonsina_y_el_mar_partitura.pdfIn PDF document text
    • http://kadanijojabuf.mywebcommunity.org/akuntansi_pemerintah_pusat.pdfIn PDF document text
    • http://linefesejewug.sportsontheweb.net/catalogue_materiel_electrique_schneider.pdfIn PDF document text
    • http://nebatomefov.scienceontheweb.net/dabadevibisutab.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://s3.amazonaws.com/wanalovum/ice_sheets_and_valley_glaciers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8eed16-cf58-4b85-82a4-cbc8ca8ad145/how_long_does_someone_live_after_being_diagnosed_with_als.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_2b3654e0aa8b415d9578a55f6e6f86f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/zemaxuba.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/aiou_online_admission_form_2019_continuing_student.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_efcf4ff7146f4edf995f171a927be4c9.pdf?index=trueIn PDF document text
    • http://todifisafi.atwebpages.com/oceanofpdf_similar_sites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa17381-81df-4140-9757-9fad808e48cf/big_nate_book_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a72d470-ea95-45a1-85cb-f5548e905a4e/15721028336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c64f47-8825-45b6-b207-83876568add3/nj_transit_bus_158_ticket_price.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_off00011702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11702 5132 bytes
SHA-256: 080cd6cceaa6c4a9879ee613551761c9fe022124e6cdfe7b04c9c2a7eb6083f8
font_01_sfnt_off0001289f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 10944 bytes
SHA-256: b3743e7701579ca86dd1eccd379b4438e03ad723d426ffa8883c44a0d66c5808
font_02_sfnt_off00014ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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