Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67a20ee975af9cb…

MALICIOUS

PDF

99.8 KB Created: 2021-03-29 20:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5b763f27275c2e22858e71e0dd600787 SHA-1: 287b18b9314b4df4299dde431e40c36b495ee67b SHA-256: c67a20ee975af9cb7ff98033cd5386ee5f9d86e96ea9472b59d877c860225528
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('maypoin.ru') that is flagged as external. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://maypoin.ru/strik?utm_term=mossberg+500+atp+riot+gun PDF link annotation
    • http://bufukaw.iblogger.org/how_to_repair_a_haier_mini_fridge.pdfIn PDF document text
    • http://nowanedilado.22web.org/dka_pediatric_guidelines.pdfIn PDF document text
    • https://rimenedefogifu.weebly.com/uploads/1/3/4/4/134466040/wuzumuduwofilo.pdfIn PDF document text
    • http://mukedasimewiri.22web.org/gomituwumobisozojalilemas.pdfIn PDF document text
    • http://vulifux.66ghz.com/6338828964.pdfIn PDF document text
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/4b0cf71370.pdfIn PDF document text
    • https://xukonixivuki.weebly.com/uploads/1/3/0/9/130969652/3592436.pdfIn PDF document text
    • http://mibemuxagegija.mywebcommunity.org/60480410549.pdfIn PDF document text
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/sefusixepoviw_fusevizeladubaj_tojegurem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419846/normal_604503cdc2fe6.pdfIn PDF document text
    • http://keruluzo.medianewsonline.com/movimiento_circular_uniformemente_variado.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/ripadudolajekaputosaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_6036fe27a42f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fezovabanufoben.epizy.com/17608488963.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/60900435204.pdfIn PDF document text
    • http://memekafese.rf.gd/adobe_reader_for_pc_setup.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/vamas.pdfIn PDF document text
    • http://setebuvoterir.rf.gd/82884237106.pdfIn PDF document text
    • http://balepififeri.rf.gd/tonoxagizivige.pdfIn PDF document text
    • http://durakukulutozar.epizy.com/apprendre_le_portugais_gratuitement.pdfIn PDF document text
    • http://pemadoludapi.rf.gd/robotic_process_automation_blue_prism.pdfIn PDF document text
    • http://tojopoxirer.rf.gd/51538943963.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000136bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BB 5368 bytes
SHA-256: aa7eaaa38e001a52c4b0c2a1ced4e0451103bd5b85f69538706cbb867a195c92
font_01_sfnt_off0001490c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490C 6148 bytes
SHA-256: 149738eb3e1d0bfb4a5732e89a115965e6f0cf3fc4971c694d3ce3619176544d
font_02_sfnt_off000158eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158EB 11956 bytes
SHA-256: da95e632dcb0e72bd04a859f6e240024fb0ac4e7cb1eb02177be011bd3846a5a

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