Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3575f88cdcfca72…

MALICIOUS

PDF

75.8 KB Created: 2021-04-05 20:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eb1d1952fc85d2e9c16dc25fa6ae22a0 SHA-1: 194e0b4f67c329354ef8beb99d9f6af4090e6553 SHA-256: d3575f88cdcfca72677983ea249787f1d4f8ef47b24841baecc04ac8db59a780
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/strik?utm_term=glacier+bay+water+dispenser+dripping PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4531523/normal_6010cb44e4378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476301/normal_6037d42fb6952.pdfIn PDF document text
    • http://kakorezikudu.mypressonline.com/materialismo_and_idealismo.pdfIn PDF document text
    • http://xejitifuwoligaf.mypressonline.com/hak_adalah.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/45680915942.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/gina_asthma.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/kunokadobames.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489050/normal_5fca82cb6895a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_88154c1fa46441e68a727694c53c2758.pdf?index=trueIn PDF document text
    • https://9ffa65b4-b95e-481c-977d-2cf6acaa57d7.filesusr.com/ugd/f68d46_7a085af7c5764da2b561ae13623e6763.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bogijexu/39651672287.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/begoxumixemagoginibo.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_86d17a745cc44ae289480f765c5b9820.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_0533f94c17994d3e91a7bd32d12447b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/angular_7_file_from_server.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/12727127912.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_05967e9633b847feb17592890398785b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desenaz/ultrasound_scan_report_boy.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_ca410748db004ebd8791f1ea231f2579.pdf?index=trueIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_0b70fd62dd5d4e2f92de26c24c2fd383.pdf?index=trueIn 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_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 5604 bytes
SHA-256: e14513e9ec475e4577007d3ca1dee49ace59dbe90445be7d04604f31b01e4f4c
font_01_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 10936 bytes
SHA-256: 62df5dc3ddea1ec969f73c319b20c8a10b0339fd107ab8f82488988898b83297

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