Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bf732764ec2f4d…

MALICIOUS

PDF

73.5 KB Created: 2021-03-12 06:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 30ddac6d6f22be5409d114411abf5394 SHA-1: d324a2844725dc0fc8c20ccfaaaeebe0546a4778 SHA-256: 55bf732764ec2f4d080cdafb4b29fb6c8afdf46dfe6ee826c8a60355d011e3d7
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/123?utm_term=bude+crooklets+surf+report PDF link annotation
    • http://ludirobus.getenjoyment.net/34904528594.pdfIn PDF document text
    • http://sifinujox.sportsontheweb.net/microsoft_office_365_administration_download.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/4330145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_600a5e651f332.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/historia_del_estado_de_mexico_desde_la_epoca_prehispanica.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/55701406327.pdfIn PDF document text
    • http://kidupat.getenjoyment.net/gisarawope.pdfIn PDF document text
    • http://talemine.getenjoyment.net/how_much_is_a_rainbow_fish.pdfIn PDF document text
    • https://diwodineguxep.weebly.com/uploads/1/3/4/3/134305573/danirakujifi_natot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_603a8b96a9679.pdfIn PDF document text
    • http://suvekitubexeso.getenjoyment.net/ximevawunafo.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/majozaki-nibifokekafipim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_67bd790a774c4202a6f8922e13b64766.pdf?index=trueIn PDF document text
    • http://moxapowi.myartsonline.com/10033970486.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_e83c065be79c49758a7d978b3ba37745.pdf?index=trueIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_a0b729f39eda4452bf9792eb62d2b739.pdf?index=trueIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_e9b86f1434f646dcb38c4c0e20a1548a.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_79909ab9ed6847c6bda95316c633a5f9.pdf?index=trueIn PDF document text
    • http://jamenajiko.myartsonline.com/calcination_and_sintering.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_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 5052 bytes
SHA-256: be5f7ae025d371e69b86ec5f87fd1a064e39ad3e393ee616b7e313eb2c7bf51d
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 10280 bytes
SHA-256: 64efd3d5a02349b0e7aaff4dca922a3af79c37620cc549e3462a435dfaaaa04f

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