Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4aa93006c0a6a85…

MALICIOUS

PDF

80.7 KB Created: 2021-05-12 22:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 80364318e5f25a548dcfd9c79b104ab6 SHA-1: 9813dff1d7031df6049e7ab3331c5164ec128c82 SHA-256: d4aa93006c0a6a850fd20d646f21af9274c7a90ad00e7af0a9975756070069e7
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to 'math worksheets for 4th grade'. The presence of numerous links on disposable hosting further supports a phishing or redirection scheme. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=math+worksheets+for+4th+grade+with+answer+key In PDF document text
    • http://rujisuki.mygamesonline.org/fewesik.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/activity_on_node_network_diagram_examples.pdfIn PDF document text
    • http://sevibifodome.getenjoyment.net/best_short_stories_in_simple_english.pdfIn PDF document text
    • http://majusenise.sportsontheweb.net/pipexulenuzuvatila.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/37159372894.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/the_hobbit_full_movie_in_hindi_download_720p.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/84084971980.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/how_to_reset_prius_maintenance.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/dulatafopufefivosawedunu.pdfIn PDF document text
    • http://kexawez.mygamesonline.org/14162334322.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/aca9213a-984c-4951-9853-2761cd2b1265/52052110639.pdfIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_2ff021122cb54b06b8657590aeb96c3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38da6d2e-b3cc-484b-9196-ed3095d1d9ec/types_of_thermal_energy_storage_systems_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6e6c72-d91d-46c3-b616-f995bb1f0ad5/doluzuje.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/bikokapika.pdfIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_f8ff9c42b1df4d1b8d0ffe82cdc8f322.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/baby_leopard_tortoise_care_sheet.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_934a651ee4ce4924afc20226337a9bbb.pdf?index=trueIn PDF document text
    • http://mifojizu.myartsonline.com/seroz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3a89ec-a1d0-4b01-8759-744c1cf46518/budufaxuwi.pdfIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_043a33f912224a95b10381aa7a4699fe.pdf?index=trueIn PDF document text
    • http://biburusig.myartsonline.com/tivimaj.pdfIn PDF document text
    • http://muliwavanebebo.onlinewebshop.net/english_sentences_with_marathi_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/kewuz.pdfIn PDF document text
    • http://mifofoxidil.onlinewebshop.net/45740184655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2291be10-9395-48b5-8b24-4b731c3029de/73315735583.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_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 5488 bytes
SHA-256: d5d3d1ca418079a8713c7b6d5cf7efeae3aca3e4bfdf12ff6076bad2c5e77bb6
font_01_sfnt_off00010fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE8 10792 bytes
SHA-256: b7e0f9d15f2ea444aac17454533caba791777f57f6490855eece4b5bfbab0c29

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